Bathymetrical distribution, of Polychaeta,300Bdellodrilus,376Bdelloida,201,203f.,211,213,215,216,222,227Bdellouridae,32,42Beania,518,525Beddard, onTetrastemma aquarium dulcium,118;on Oligochaeta,347f.;on Leeches,392f.Bedwell, on Rotifers,198Beneden, van, on Cestodes,76;on Nematodes,162;onPhoronis,450Benham, on a fresh-waterTetrastemma,118;on Archiannelida,241f.;on Polychaeta,245f.;on Myzostomaria,341f.;on Oligochaeta,357,373,382;onPhoronis,452f.Benhamia,383f.Bicellaria,481,518,526,527Bilfinger, on Rotifers,212Bilharzia,4,73;B. crassa,70;B. haematobia,63,68f.,69Bimastos,389Bipaliidae,35,42Bipalium,33,34,42,408Birds, Trematodes of,62,63,64,72;Cestodes of,77f.,84,85;Nematodes of,144,149,163;Gordiusof,173;Acanthocephala of,184,185Bisexual, Turbellaria,44;Trematodes,70f.Bladder, of Rotifers,214Bladder-worms,5,79f.,89Blanchard, on Cestoda,91;on Hirudinea,392f.,405,408Blastomeres, of egg ofDistomum,65Blood, of Nemertinea,108;ofPolygordius,244;of Chaetopoda,252;of Chlorhaemidae,252,334;ofMagelona,252,325;of Sabelliformia,252,337Blood-corpuscles, in Chaetopoda,252Body-cavity (including Coelom), of Nematoda,130;ofGordius,166;of Acanthocephala,175,178;of Chaetognatha,187;of Archiannelids,243,244;of Polychaeta,249;ofMyzostoma,343;of Oligochaeta,355;of Leeches,397;of Gephyrea,416;ofPhoronis,454,462;of Polyzoa,468,488,495Body-wall, of Nemertinea,102,103;of Nematodes,125;of Gordiidae,165;of Acanthocephala,175;of Chaetognatha,187;of Rotifers,205;ofNereis,249;of Oligochaeta,349;of Gephyrea,414,436;ofPhoronis,454;of Polyzoa,470,495,500Bohadsch, on Gephyrea,411Bohemilla,377;chaeta,350Bonellein,435,292Bonellia,411,434,442;anatomy,434f.,435;male,438;development,439;habits of,442;as host,297Bonnet, on Oligochaeta,348,379Boring Worms,286,287Borlase, onLineus marinus,99Borlasia elizabethae,111,114Bothriocephalidae,91Bothriocephalinae,91Bothriocephalus,91;B. cordatus,81,91;B. cristatus,81,91;B. latus, in man,81,91;life-history,84;reproductive organs,87f.;larva,87;B. mansoni(=B. liguloides),81,91Bothriocerca,226Bothrioneuron,379Bothrioplana,46,50Bothrioplanidae,42,46,50Bothromesostoma personatum,49Bourne, on Oligochaeta,352,373,377n.,380;on Leeches,400Bouvier, on commensal Gephyrea,429Bowerbankia,470,480,481,492,500,518,532,533;larva,511,513;budding,514Brachionidae,225Brachionus,200,201,204,218,225,226,227Brachydrilus,357Brackish water, Rotifers,226;Polychaeta,284;Polyzoa,492Bradynema,150,151,160Braem, on statoblasts,503f.Brain—see Nervous SystemBranchellion,393,395,397,401,406Branchial crown,336;regeneration of,283Branchiobdella,376Branchiomma,337;gills,261;eyes,272;B. vigilansonAphrodite,299Branchiura,352,361,367,378f.;transverse section,353Braun, on Platyhelminthes, etc.,6n.,55n.,62,94Brettia,525,527Bristles = Chaetae,q.v.Bristle-worms,241British, Polycladida,19;Tricladida,42;Rhabdocoelida,49;Nemertinea,100,110f.;Polychaeta,306f.;Earthworms,390;Leeches,393;Gephyrea,449;Polyzoa,488n.,505,523f.Brood-pouch, ofSpirorbis,261,276,341;ofSalmacina,276;of Entoprocta,487,507Brood-sac, ofAutolytus,275;ofMyrianida,280Brown body, in Polyzoa,468,471f.,472,489,496,510,514Brown tubes (nephridia), of Sipunculoidea,415,417,423,425;of Echiuroidea,435,437,439,441;of Epithetosomatoidea,445;used as generative ducts,418,438;absent in Priapuloidea,430Bryozoa,475Buccal region, in Polychaeta,249,250,269;ofNereis diversicolor,248;ofN. cultrifera,316Buchanan, on marine muds,423Buchholzia,359Budding, in Syllidae,279,283(see also Gemmation);in Polyzoa,467,514(see also Polypide-bud)Bugula,467,468,477,481,515,517,518,519,526;avicularia,483,485;larva,511Bunge, on respiration in Nematoda,130Bürger, on Nemertinea,109,112;onNectonema,168;on Hirudinea,397,403Burrows, of Polychaeta,285,304;ofCirratulus,286;ofNereis,286,316,317;ofArenicola,333;fossil,302;of Earthworms,368;ofSipunculus,426Bursa seminalis, in Rhabdocoels,48Busk, on Polyzoa,465n.,475,487,519Buskia,533Bütschli, on Nematoda,137Byrsophlebs, occurrence,44;British species,49Caberea,487,518,526;vibracula,486,517Caecum, in Polyzoa,499Calathus, host ofGordius,172Calceostominae,73Calceostomum,73Caldwell, onPhoronis,454,456,461Calicotyle,73Callidina,201,202,204,218,219,222,225,227,230Calliobothrium,76n.,91;larva,77Calotte, of Dicyemids,93Calyx,488Camerano, on development ofGordius,170Capitella,331;peristomium,263;special chaetae,267,268;habitat,286;colour,291;O. capitata, distribution,299Capitellidae,258,331,373Capitelliformia,258,305;guanin in,253;body,259;buccal region,269;siphon,272;ciliated organs,272,273;genital organs,273Carabus, host ofGordius,172Carinella,112;British species,112Carinellidae, side organs of,107Caruncle, of Amphinomidae,260,273n.,318Caryophyllaeus,91;C. mutabilis,77Castalia,308;distribution of,300Castings, of Polychaeta,285;fossil,302;ofArenicola,333Castrada,44,49Cat, parasites of,80,125,130,140,143,144,145Catenicella,518,519Catenula,49Cathypna,225Cathypnidae,225Cellaria,479,515,518,519,526;zooecia and avicularium,482Cellepora,518,527,528,529;avicularia,483,517Celleporella,529Cellularia,518,527Cellularina,518Cement-glands, of Rotifers,205Cephalic slits, of Nemertinea,101,104,107,111,112Cephalisation, in Polychaeta,263;in Oligochaeta,377Cephalodiscus,461f.Cephalopods, parasites of,78,92;list of, containing Dicyemids,94Cephalosiphon,205,221Cephalothrix,112Cercaria,13,65,67,71f.;C. macrocerca,72;C. cystophora,72Cercyra,42Cerebral organ, of Nemertinea,107;of Gephyrea,417Cerebratulus,101,111,114;British species,111Cerfontaine, on Earthworms,349,350Cestoda, characters of the group,5,74;nature of,76f.;occurrence,77-82;life-histories,83;structure and development,84-89;synoptic table of,89f.;classification,91Cestodariidae (= Monozoa),91Cestoplana,17,18,19Cestoplanidae,19Chaetae,241;of Polychaeta,266,267;provisional,274;ofNereis,246,247;of Heteronereid,276,277;jointed,246;natatory, in sexual Syllid,278,307;iridescent,268,291,312;palmate, ofCoabangia,339n.;colour,291;genital, ofCapitella,331;ofSternaspis,336;special, ofPolydora,261,267;ofChaetopterus,267,324;ofMyzostoma,342;of Oligochaeta,347,350,351,352;penial,362;of Microdrili,375f.;of Megadrili,381f.;of Lumbricidae,389,390;of Leeches,395,396;(= hooks), of Echiuroid Gephyrea,434,435,438,440f.,446Chaetifera,445,446Chaetobranchus,352Chaetogaster,356,377,401Chaetognatha,186f.,534;anatomy,186;development,189;habits,189;classification,191;key to,193;American species,534Chaetonotus,232,235Chaetopoda,241f.;as food for Nemertinea,115Chaetopteridae,258,323
Bathymetrical distribution, of Polychaeta,300
Bdellodrilus,376
Bdelloida,201,203f.,211,213,215,216,222,227
Bdellouridae,32,42
Beania,518,525
Beddard, onTetrastemma aquarium dulcium,118;
on Oligochaeta,347f.;
on Leeches,392f.
Bedwell, on Rotifers,198
Beneden, van, on Cestodes,76;
on Nematodes,162;
onPhoronis,450
Benham, on a fresh-waterTetrastemma,118;
on Archiannelida,241f.;
on Polychaeta,245f.;
on Myzostomaria,341f.;
on Oligochaeta,357,373,382;
onPhoronis,452f.
Benhamia,383f.
Bicellaria,481,518,526,527
Bilfinger, on Rotifers,212
Bilharzia,4,73;
B. crassa,70;
B. haematobia,63,68f.,69
Bimastos,389
Bipaliidae,35,42
Bipalium,33,34,42,408
Birds, Trematodes of,62,63,64,72;
Cestodes of,77f.,84,85;
Nematodes of,144,149,163;
Gordiusof,173;
Acanthocephala of,184,185
Bisexual, Turbellaria,44;
Trematodes,70f.
Bladder, of Rotifers,214
Bladder-worms,5,79f.,89
Blanchard, on Cestoda,91;
on Hirudinea,392f.,405,408
Blastomeres, of egg ofDistomum,65
Blood, of Nemertinea,108;
ofPolygordius,244;
of Chaetopoda,252;
of Chlorhaemidae,252,334;
ofMagelona,252,325;
of Sabelliformia,252,337
Blood-corpuscles, in Chaetopoda,252
Body-cavity (including Coelom), of Nematoda,130;
ofGordius,166;
of Acanthocephala,175,178;
of Chaetognatha,187;
of Archiannelids,243,244;
of Polychaeta,249;
ofMyzostoma,343;
of Oligochaeta,355;
of Leeches,397;
of Gephyrea,416;
ofPhoronis,454,462;
of Polyzoa,468,488,495
Body-wall, of Nemertinea,102,103;
of Nematodes,125;
of Gordiidae,165;
of Acanthocephala,175;
of Chaetognatha,187;
of Rotifers,205;
ofNereis,249;
of Oligochaeta,349;
of Gephyrea,414,436;
ofPhoronis,454;
of Polyzoa,470,495,500
Bohadsch, on Gephyrea,411
Bohemilla,377;
chaeta,350
Bonellein,435,292
Bonellia,411,434,442;
anatomy,434f.,435;
male,438;
development,439;
habits of,442;
as host,297
Bonnet, on Oligochaeta,348,379
Boring Worms,286,287
Borlase, onLineus marinus,99
Borlasia elizabethae,111,114
Bothriocephalidae,91
Bothriocephalinae,91
Bothriocephalus,91;
B. cordatus,81,91;
B. cristatus,81,91;
B. latus, in man,81,91;
life-history,84;
reproductive organs,87f.;
larva,87;
B. mansoni(=B. liguloides),81,91
Bothriocerca,226
Bothrioneuron,379
Bothrioplana,46,50
Bothrioplanidae,42,46,50
Bothromesostoma personatum,49
Bourne, on Oligochaeta,352,373,377n.,380;
on Leeches,400
Bouvier, on commensal Gephyrea,429
Bowerbankia,470,480,481,492,500,518,532,533;
larva,511,513;
budding,514
Brachionidae,225
Brachionus,200,201,204,218,225,226,227
Brachydrilus,357
Brackish water, Rotifers,226;
Polychaeta,284;
Polyzoa,492
Bradynema,150,151,160
Braem, on statoblasts,503f.
Brain—see Nervous System
Branchellion,393,395,397,401,406
Branchial crown,336;
regeneration of,283
Branchiobdella,376
Branchiomma,337;
gills,261;
eyes,272;
B. vigilansonAphrodite,299
Branchiura,352,361,367,378f.;
transverse section,353
Braun, on Platyhelminthes, etc.,6n.,55n.,62,94
Brettia,525,527
Bristles = Chaetae,q.v.
Bristle-worms,241
British, Polycladida,19;
Tricladida,42;
Rhabdocoelida,49;
Nemertinea,100,110f.;
Polychaeta,306f.;
Earthworms,390;
Leeches,393;
Gephyrea,449;
Polyzoa,488n.,505,523f.
Brood-pouch, ofSpirorbis,261,276,341;
ofSalmacina,276;
of Entoprocta,487,507
Brood-sac, ofAutolytus,275;
ofMyrianida,280
Brown body, in Polyzoa,468,471f.,472,489,496,510,514
Brown tubes (nephridia), of Sipunculoidea,415,417,423,425;
of Echiuroidea,435,437,439,441;
of Epithetosomatoidea,445;
used as generative ducts,418,438;
absent in Priapuloidea,430
Bryozoa,475
Buccal region, in Polychaeta,249,250,269;
ofNereis diversicolor,248;
ofN. cultrifera,316
Buchanan, on marine muds,423
Buchholzia,359
Budding, in Syllidae,279,283(see also Gemmation);
in Polyzoa,467,514(see also Polypide-bud)
Bugula,467,468,477,481,515,517,518,519,526;
avicularia,483,485;
larva,511
Bunge, on respiration in Nematoda,130
Bürger, on Nemertinea,109,112;
onNectonema,168;
on Hirudinea,397,403
Burrows, of Polychaeta,285,304;
ofCirratulus,286;
ofNereis,286,316,317;
ofArenicola,333;
fossil,302;
of Earthworms,368;
ofSipunculus,426
Bursa seminalis, in Rhabdocoels,48
Busk, on Polyzoa,465n.,475,487,519
Buskia,533
Bütschli, on Nematoda,137
Byrsophlebs, occurrence,44;
British species,49
Caberea,487,518,526;
vibracula,486,517
Caecum, in Polyzoa,499
Calathus, host ofGordius,172
Calceostominae,73
Calceostomum,73
Caldwell, onPhoronis,454,456,461
Calicotyle,73
Callidina,201,202,204,218,219,222,225,227,230
Calliobothrium,76n.,91;
larva,77
Calotte, of Dicyemids,93
Calyx,488
Camerano, on development ofGordius,170
Capitella,331;
peristomium,263;
special chaetae,267,268;
habitat,286;
colour,291;
O. capitata, distribution,299
Capitellidae,258,331,373
Capitelliformia,258,305;
guanin in,253;
body,259;
buccal region,269;
siphon,272;
ciliated organs,272,273;
genital organs,273
Carabus, host ofGordius,172
Carinella,112;
British species,112
Carinellidae, side organs of,107
Caruncle, of Amphinomidae,260,273n.,318
Caryophyllaeus,91;
C. mutabilis,77
Castalia,308;
distribution of,300
Castings, of Polychaeta,285;
fossil,302;
ofArenicola,333
Castrada,44,49
Cat, parasites of,80,125,130,140,143,144,145
Catenicella,518,519
Catenula,49
Cathypna,225
Cathypnidae,225
Cellaria,479,515,518,519,526;
zooecia and avicularium,482
Cellepora,518,527,528,529;
avicularia,483,517
Celleporella,529
Cellularia,518,527
Cellularina,518
Cement-glands, of Rotifers,205
Cephalic slits, of Nemertinea,101,104,107,111,112
Cephalisation, in Polychaeta,263;
in Oligochaeta,377
Cephalodiscus,461f.
Cephalopods, parasites of,78,92;
list of, containing Dicyemids,94
Cephalosiphon,205,221
Cephalothrix,112
Cercaria,13,65,67,71f.;
C. macrocerca,72;
C. cystophora,72
Cercyra,42
Cerebral organ, of Nemertinea,107;
of Gephyrea,417
Cerebratulus,101,111,114;
British species,111
Cerfontaine, on Earthworms,349,350
Cestoda, characters of the group,5,74;
nature of,76f.;
occurrence,77-82;
life-histories,83;
structure and development,84-89;
synoptic table of,89f.;
classification,91
Cestodariidae (= Monozoa),91
Cestoplana,17,18,19
Cestoplanidae,19
Chaetae,241;
of Polychaeta,266,267;
provisional,274;
ofNereis,246,247;
of Heteronereid,276,277;
jointed,246;
natatory, in sexual Syllid,278,307;
iridescent,268,291,312;
palmate, ofCoabangia,339n.;
colour,291;
genital, ofCapitella,331;
ofSternaspis,336;
special, ofPolydora,261,267;
ofChaetopterus,267,324;
ofMyzostoma,342;
of Oligochaeta,347,350,351,352;
penial,362;
of Microdrili,375f.;
of Megadrili,381f.;
of Lumbricidae,389,390;
of Leeches,395,396;
(= hooks), of Echiuroid Gephyrea,434,435,438,440f.,446
Chaetifera,445,446
Chaetobranchus,352
Chaetogaster,356,377,401
Chaetognatha,186f.,534;
anatomy,186;
development,189;
habits,189;
classification,191;
key to,193;
American species,534
Chaetonotus,232,235
Chaetopoda,241f.;
as food for Nemertinea,115
Chaetopteridae,258,323