on Hirudinea,395Grubea,308;attachment of eggs,275Guanin, in coelomic corpuscles,253Guinea-worm,147Gunda,31,41,42Gundidae,42Gymnolaemata,476,512,518;lophophore,476;in fresh water,492Gyrator hermaphroditus,49Gyrocotyle(=Amphiptyches),91;G. rugosa,77;G. urna,77Gyrodactylidae,53,61,73Gyrodactylinae,73Gyrodactylus,55,61,73Haberlandt, onConvoluta,43Habits, of Platyhelminthes,3,7,21,35,43;of Nemertinea,114;of Gordiidae,170f.;of Chaetognatha,189;of Rotifers,206,226;of Gastrotricha,232,234,235;of Polychaeta,285;of Oligochaeta,366;of Gephyrea,426,433,442;ofPhoronis,451Haemadipsa,408;eye,394Haemal fluid,252Haematocleptes, parasitic,297Haementeria,407Haemerythrin,416;inMagelona,252Haemoglobin, in Nemertinea,107,108;in Chaetopoda,252,253,291,356;in Gephyrea,437;inPhoronis,456Haemopis,393,407Halicryptus,432,433;anatomy,430Hallez, on Turbellaria,7,21,40Halosydna,298Hamann, on Nematoda,131,133,136n.;on Acanthocephala,176,180Hamingia,435f.,442;males of,438Haplobranchus,339;gills,261Haplodiscus,43,49Haplodrili,241Hares, parasites of,141,145Harker, on Oligochaeta,369Harmer, on Polyzoa,465f.Harris, on Rotifera,197Hartog, on Rotifera,197f.;on Gastrotricha,231f.;on Kinorhyncha,236f.Haswell, on Temnocephalidae,53;onPhoronis,451Hatschek, on affinities of Polyclads,28n.;on nature of Cestodes,76;on Trochophore,229;on development of Gephyrea,419,447Head, ofNereis,246,248;of Polychaeta,259f.;regeneration of,283;ofTomopteris,315;ofAphrodite,260;of Chlorhaemidae,334;ofEunice,262;ofNephthys,262;ofPhyllodoce,262;ofPolydora,261;of Polynoid,262;ofSabella,261;ofSabellaria,263;of Syllid,262;ofTrophonia,262Hedruris,163Hekaterobranchus,326Heliodrilus,359,380Heliopora, containingPolydora,298Heller, on human parasites,139Hemichordata,462Hemilepidia, colour of,292Hemistomum,73Hemitubifex,378Henlea,369Hermadion,299Hermaphrodite, Nemertinea,109;Polychaeta,273f.Hermellidae,258,341Hermelliformia,258,306,341Hermione,312;chaetae,266,267Hermionina,309,311Herpobdellidae,407Hertwig, O., on Chaetognatha,187n.Hesionidae,258,308;segments,258;head,263;swim-bladder,272;genital organs,274;parasitic,297Hesperodrilus,352f.,369,378f.Hesse, on nervous system of Nematoda,127Heterakis,131,139Heterocotylea,73Heterodera,155,160,164Heterogamy,66n.Heteronemertini,113Heteronereid phase,276f.;chaetae,246,276;parapodia,276,277Heteronereis,276,281—see HeteronereidHeteropora,520n.Heterosyllis,278,279,281Hexacotyle,73Hexarthra,223,226Hibernaculum,501,502Hincks, on Polyzoa,475,500,508,516,519,523Hippothoa,528Hippuraria,533Hirudinea,241,392f.;external characters,392;British species,393;eyes,395;branchiae,395;alimentary canal,396;vascular system,396;body-cavity,397;nephridia,399;reproductive organs,401;cocoons,404;classification,405Hirudiniculture,393Hirudo,393,396f.,399,403,405,407;nephridium,400Hislopia,492Histioderma,302Histriobdella,242n.Histriodrilus,242n.Holloway, on Rotifers,227Holomyarii,137Holostomatidae,63,64,73Holostomum,73;H. excavatum,63Holothurian, as host,298Homalogaster,73Hood, ofSabellaria,263,306Hooks, of Trematodes,53,56,57;of Cestodes,75,85;of Cestode-larvae,87,88;taxonomic value in Cestodes,90f.Hoplonemertea,106,109,110;auditory organs,106,110;British species,110;characters,110;development,113;proboscis,110Hornera,518,532Horse, parasites of,68,83,90,125,140,142,163Horse-leeches,393f.Horst, on Oligochaeta,354Hubrecht on Nemertinea, affinities,120;classification,109;excretory system,108;nervous system,105Hudson, on Rotifera,197,198,215n.,220n.,223n.,228Hudsonella,224Huxley, on Rotifers,198,229;on Polychaeta,246;on Molluscoidea,475Huxleya,525,527Hyalinoecia,299,318,319;tentacles,262;composition of tube of,290Hydatina,199,200,202,204,213,224,226,228Hydatinidae,224Hymenolepis,91;generic characters,91;H. diminuta(=Taenia flavopunctata), life-history,83;specific characters,91;H. murina(=Taenia murina),70;life-history,83,89,91;H. nana,80;life-history,83;specific characters,91Hyocrinus, as host,342Hyperiodrilus,363f.;reproductive organs,363Hypodermic impregnation,27,218Hypodermis (= Epidermis) ofGordius,165;of Rotifera, etc.,205,232Hypophorella,478,518,533;larva,510Hyporhynchus,49Hystrichis,147,149,163Ichthydium,235Ichthyobdellidae,406Ichthyonema,131,147,149,163Ichthyotaenia,91Ichthyotaeninae,85,91Idmonea,518,532Iguana, parasites of,142Iijima, on yolk-glands,38n.Illoricata,223Ilyodrilus,378;chaeta,350Ilyogenia,388Imogine,19Inarticulata,517,518Incudate,210,211Incus, in Rotifers,210Inermia,445Infusoriform embryos,93Insects, parasites of,142,150,152,153,154,160,163,179,183,184,185Internal sac,509,511Internode,525Interproglottidal glands,90Intertentacular organ,469,473,508Introvert, in Polychaeta,249,250;in Gephyrea,412,424Investing membrane, in ectoparasitic Trematodes,57;in Cestodes,85Ioda, form of head,278Isacis,163Jammes, on skin of Nematoda,126Jaws, ofNereis,248,250,270;of Polychaeta,269f.;of Eunicidae,270;of Polynoid,270;ofAutolytus,270;fossil,302;ofGlycera,270Jelly, Miss, on Polyzoa,523Jensenia,50Jimenez, on Leeches,407Joblot, on Rotifers,197Johnston, on Hirudinea,393Joliet, on development of Rotifers,218;on Polyzoa,508Jungermanniaceae, inhabited by Rotifers,227Jurassic, Serpulids,301;Polyzoa,520f.Kaiser, on Acanthocephala,177Kamptoderm,469,470Keferstein, on Polycladida,7,10Kennel, von, on Nemertinea,108;onMalacobdella,101n.,119Kerria,384Kinorhyncha,236f.Kleinenberg, on Trochophore,229Koellikeria,73Kölliker, onDistomum okenii,71Koren and Danielssen, on Gephyrea,442,443Kowalevsky, on Hirudinea,397;onPhoronis,458Kraepelin, on Polyzoa,493,502Krause, on parasites,163Krohn, on Nemertine development,99Krohnia,186;species,192,194;American species,534Krukenberg, on haemerythrin,416Kynotus,386Labrorostratus,297Lacinularia,200,213,215,221,226Lacrymaria,235Laetmonice,312Lagenipora,528Lamarck, on Gephyrea,411Land, Planarians,4,30,33,34,36;Nemertines,101,117;Oligochaeta,347f.;Leeches,408Lang, on Polyclads,7,17,21f.,27,28n.;on nature of Cestodes,76Lanice,328;Hypophorellain tubes of,478,533Lankester, on Trochosphere,229;on Earthworms,347;on Hirudinea,397;on Gephyrea,430,437,439;on Podaxonia,461Larva, Müller's,29;ofPolystomum,59;ofDiplozoon,60;ofGyrodactylus,61;of Holostomatidae,63,64;ofDistomum64,65,67;hosts of larvae of digenetic Trematodes,71f.;ofCalliobothrium,77;of Cestodes,79f.;table of Cestode larvae,83,85,87;ofSchistocephalus,84;ofBothriocephalus,87;ofDipylidium(Cysticercoid),83,88f.;of Mesozoa,92,93;of Nemertinea,113;Trochosphere,229,274,439,510;ofPolygordius,245;of Polychaeta,274,275;ofChaetopterus,325;ofMyzostoma,344;of Gephyrea,419,439;ofPhoronis,458;of Polyzoa,466,509,511,520Lateral organs, of Capitellidae,343—see also Ciliated pitsLaurer's Canal (= Laurer-Stieda canal),57,87Leaena,300,327n.Lecanocephalus,131,133Leckenby, onPriapulus,433
on Hirudinea,395
Grubea,308;
attachment of eggs,275
Guanin, in coelomic corpuscles,253
Guinea-worm,147
Gunda,31,41,42
Gundidae,42
Gymnolaemata,476,512,518;
lophophore,476;
in fresh water,492
Gyrator hermaphroditus,49
Gyrocotyle(=Amphiptyches),91;
G. rugosa,77;
G. urna,77
Gyrodactylidae,53,61,73
Gyrodactylinae,73
Gyrodactylus,55,61,73
Haberlandt, onConvoluta,43
Habits, of Platyhelminthes,3,7,21,35,43;
of Nemertinea,114;
of Gordiidae,170f.;
of Chaetognatha,189;
of Rotifers,206,226;
of Gastrotricha,232,234,235;
of Polychaeta,285;
of Oligochaeta,366;
of Gephyrea,426,433,442;
ofPhoronis,451
Haemadipsa,408;
eye,394
Haemal fluid,252
Haematocleptes, parasitic,297
Haementeria,407
Haemerythrin,416;
inMagelona,252
Haemoglobin, in Nemertinea,107,108;
in Chaetopoda,252,253,291,356;
in Gephyrea,437;
inPhoronis,456
Haemopis,393,407
Halicryptus,432,433;
anatomy,430
Hallez, on Turbellaria,7,21,40
Halosydna,298
Hamann, on Nematoda,131,133,136n.;
on Acanthocephala,176,180
Hamingia,435f.,442;
males of,438
Haplobranchus,339;
gills,261
Haplodiscus,43,49
Haplodrili,241
Hares, parasites of,141,145
Harker, on Oligochaeta,369
Harmer, on Polyzoa,465f.
Harris, on Rotifera,197
Hartog, on Rotifera,197f.;
on Gastrotricha,231f.;
on Kinorhyncha,236f.
Haswell, on Temnocephalidae,53;
onPhoronis,451
Hatschek, on affinities of Polyclads,28n.;
on nature of Cestodes,76;
on Trochophore,229;
on development of Gephyrea,419,447
Head, ofNereis,246,248;
of Polychaeta,259f.;
regeneration of,283;
ofTomopteris,315;
ofAphrodite,260;
of Chlorhaemidae,334;
ofEunice,262;
ofNephthys,262;
ofPhyllodoce,262;
ofPolydora,261;
of Polynoid,262;
ofSabella,261;
ofSabellaria,263;
of Syllid,262;
ofTrophonia,262
Hedruris,163
Hekaterobranchus,326
Heliodrilus,359,380
Heliopora, containingPolydora,298
Heller, on human parasites,139
Hemichordata,462
Hemilepidia, colour of,292
Hemistomum,73
Hemitubifex,378
Henlea,369
Hermadion,299
Hermaphrodite, Nemertinea,109;
Polychaeta,273f.
Hermellidae,258,341
Hermelliformia,258,306,341
Hermione,312;
chaetae,266,267
Hermionina,309,311
Herpobdellidae,407
Hertwig, O., on Chaetognatha,187n.
Hesionidae,258,308;
segments,258;
head,263;
swim-bladder,272;
genital organs,274;
parasitic,297
Hesperodrilus,352f.,369,378f.
Hesse, on nervous system of Nematoda,127
Heterakis,131,139
Heterocotylea,73
Heterodera,155,160,164
Heterogamy,66n.
Heteronemertini,113
Heteronereid phase,276f.;
chaetae,246,276;
parapodia,276,277
Heteronereis,276,281—see Heteronereid
Heteropora,520n.
Heterosyllis,278,279,281
Hexacotyle,73
Hexarthra,223,226
Hibernaculum,501,502
Hincks, on Polyzoa,475,500,508,516,519,523
Hippothoa,528
Hippuraria,533
Hirudinea,241,392f.;
external characters,392;
British species,393;
eyes,395;
branchiae,395;
alimentary canal,396;
vascular system,396;
body-cavity,397;
nephridia,399;
reproductive organs,401;
cocoons,404;
classification,405
Hirudiniculture,393
Hirudo,393,396f.,399,403,405,407;
nephridium,400
Hislopia,492
Histioderma,302
Histriobdella,242n.
Histriodrilus,242n.
Holloway, on Rotifers,227
Holomyarii,137
Holostomatidae,63,64,73
Holostomum,73;
H. excavatum,63
Holothurian, as host,298
Homalogaster,73
Hood, ofSabellaria,263,306
Hooks, of Trematodes,53,56,57;
of Cestodes,75,85;
of Cestode-larvae,87,88;
taxonomic value in Cestodes,90f.
Hoplonemertea,106,109,110;
auditory organs,106,110;
British species,110;
characters,110;
development,113;
proboscis,110
Hornera,518,532
Horse, parasites of,68,83,90,125,140,142,163
Horse-leeches,393f.
Horst, on Oligochaeta,354
Hubrecht on Nemertinea, affinities,120;
classification,109;
excretory system,108;
nervous system,105
Hudson, on Rotifera,197,198,215n.,220n.,223n.,228
Hudsonella,224
Huxley, on Rotifers,198,229;
on Polychaeta,246;
on Molluscoidea,475
Huxleya,525,527
Hyalinoecia,299,318,319;
tentacles,262;
composition of tube of,290
Hydatina,199,200,202,204,213,224,226,228
Hydatinidae,224
Hymenolepis,91;
generic characters,91;
H. diminuta(=Taenia flavopunctata), life-history,83;
specific characters,91;
H. murina(=Taenia murina),70;
life-history,83,89,91;
H. nana,80;
life-history,83;
specific characters,91
Hyocrinus, as host,342
Hyperiodrilus,363f.;
reproductive organs,363
Hypodermic impregnation,27,218
Hypodermis (= Epidermis) ofGordius,165;
of Rotifera, etc.,205,232
Hypophorella,478,518,533;
larva,510
Hyporhynchus,49
Hystrichis,147,149,163
Ichthydium,235
Ichthyobdellidae,406
Ichthyonema,131,147,149,163
Ichthyotaenia,91
Ichthyotaeninae,85,91
Idmonea,518,532
Iguana, parasites of,142
Iijima, on yolk-glands,38n.
Illoricata,223
Ilyodrilus,378;
chaeta,350
Ilyogenia,388
Imogine,19
Inarticulata,517,518
Incudate,210,211
Incus, in Rotifers,210
Inermia,445
Infusoriform embryos,93
Insects, parasites of,142,150,152,153,154,160,163,179,183,184,185
Internal sac,509,511
Internode,525
Interproglottidal glands,90
Intertentacular organ,469,473,508
Introvert, in Polychaeta,249,250;
in Gephyrea,412,424
Investing membrane, in ectoparasitic Trematodes,57;
in Cestodes,85
Ioda, form of head,278
Isacis,163
Jammes, on skin of Nematoda,126
Jaws, ofNereis,248,250,270;
of Polychaeta,269f.;
of Eunicidae,270;
of Polynoid,270;
ofAutolytus,270;
fossil,302;
ofGlycera,270
Jelly, Miss, on Polyzoa,523
Jensenia,50
Jimenez, on Leeches,407
Joblot, on Rotifers,197
Johnston, on Hirudinea,393
Joliet, on development of Rotifers,218;
on Polyzoa,508
Jungermanniaceae, inhabited by Rotifers,227
Jurassic, Serpulids,301;
Polyzoa,520f.
Kaiser, on Acanthocephala,177
Kamptoderm,469,470
Keferstein, on Polycladida,7,10
Kennel, von, on Nemertinea,108;
onMalacobdella,101n.,119
Kerria,384
Kinorhyncha,236f.
Kleinenberg, on Trochophore,229
Koellikeria,73
Kölliker, onDistomum okenii,71
Koren and Danielssen, on Gephyrea,442,443
Kowalevsky, on Hirudinea,397;
onPhoronis,458
Kraepelin, on Polyzoa,493,502
Krause, on parasites,163
Krohn, on Nemertine development,99
Krohnia,186;
species,192,194;
American species,534
Krukenberg, on haemerythrin,416
Kynotus,386
Labrorostratus,297
Lacinularia,200,213,215,221,226
Lacrymaria,235
Laetmonice,312
Lagenipora,528
Lamarck, on Gephyrea,411
Land, Planarians,4,30,33,34,36;
Nemertines,101,117;
Oligochaeta,347f.;
Leeches,408
Lang, on Polyclads,7,17,21f.,27,28n.;
on nature of Cestodes,76
Lanice,328;
Hypophorellain tubes of,478,533
Lankester, on Trochosphere,229;
on Earthworms,347;
on Hirudinea,397;
on Gephyrea,430,437,439;
on Podaxonia,461
Larva, Müller's,29;
ofPolystomum,59;
ofDiplozoon,60;
ofGyrodactylus,61;
of Holostomatidae,63,64;
ofDistomum64,65,67;
hosts of larvae of digenetic Trematodes,71f.;
ofCalliobothrium,77;
of Cestodes,79f.;
table of Cestode larvae,83,85,87;
ofSchistocephalus,84;
ofBothriocephalus,87;
ofDipylidium(Cysticercoid),83,88f.;
of Mesozoa,92,93;
of Nemertinea,113;
Trochosphere,229,274,439,510;
ofPolygordius,245;
of Polychaeta,274,275;
ofChaetopterus,325;
ofMyzostoma,344;
of Gephyrea,419,439;
ofPhoronis,458;
of Polyzoa,466,509,511,520
Lateral organs, of Capitellidae,343—see also Ciliated pits
Laurer's Canal (= Laurer-Stieda canal),57,87
Leaena,300,327n.
Lecanocephalus,131,133
Leckenby, onPriapulus,433