c.Dermis.cu.Cuticle.ep.c.Epidermis cells.pi.Deposit of pigment in outer ends of epidermis cells.s.p.Secondary papillæ.
Fig. 33. Female generative organs ofPeripatus capensis, × 5. (From a rough drawing by Prof. Balfour.) The following note was appended to this drawing:“Ovary rather to dorsal side, lying in a central compartment of body-cavity and attached to one of the longitudinal septa, dividing this from the lateral compartment between the penultimate pair of legs and that next in front. The oviducts cross before opening to the exterior, the right oviduct passing under the rectum and the left over it. They meet by opening into a common vestibule, which in its turn opens below the anus. On each side of it are a pair of short papillæ (aborted feet?).”
F.16, 17. Last two pairs of legs.od.Oviduct.ov.Ovary.ut.Uterus.v.c.Nerve-cord.
Plate 53.
Figs. 34-39. Five young embryos ofPeripatus capensis; ventral view. All, excepting Fig. 37, from drawings by Miss Balfour. In figures 34 to 38adenotes what is probably the anterior extremity.
Fig. 34, Stage A. Youngest embryo found, with slightly elongated blastopore.
Fig. 35, Stage B. Embryo with three mesoblastic somites and elongated blastopore. The external boundaries of the somites are not distinct.
Fig. 36, Stage C. Embryo with five somites. The blastopore is closing in its middle portion.
Fig. 37, Stage D. The blastopore has completely closed in its middle portion, and given rise to two openings, the future mouth and anus. (From a rough drawing left by Professor Balfour.) (Zeiss A, Camera Oberhaus. on level of stage.)
The following note was appended to this drawing in his handwriting:“Young larva ofPeripatus capensis. I could not tell for certain which was the anterior end. Length, 1.34mm.”
Fig. 38, Stage E. Embryo with about thirteen mesoblastic somites in which the flexure of the hind part of the body has commenced. The remains of the original blastopore are present as the mouth, placed between the second pair of mesoblastic somites, and the anus placed on the concavity of the commencing flexure of the hind part of the body.
Fig. 39. Side view of same embryo.
Figs. 40-42. Drawings by Professor Balfour of three transverse sections through the embryo from which fig. 36 was taken. (Zeiss c, Camera.) Figs. 40 and 42 pass through the region of the blastopore.
bl.Blastopore.ep.Epiblast.hy.Hypoblast.me.Mesenteron.mes.Mesoblastic somite.
Fig. 43. Male generative organs ofPeripatus capensis, viewed from the dorsal surface. (From a drawing by Miss Balfour.)
a.g.Enlarged crural glands of last pair of legs.F.16, 17. Last pairs of legs.f.Small accessory glandular tubes.p.Common duct into which vasa deferentia open.p.r.Prostate.te.Testes.v.c.Nerve-cord.v.d.Vas deferens.
[572]Comparative Embryology; original edition,Vol.I.p. 318. [This edition,Vol.II.p. 385.]
[573]We have seen nothing in any of our sections which we can identify as of so-called mesenchymatous origin.
[574]This edition,Vol.II.p. 457.
[575]This edition,Vol.III.p. 352.
[576]This edition,Vol.III.p. 356.
[577]This edition,Vol.III.pp.378, 379.
[578]The explanations of the figures printed within inverted commas are by Professor Balfour, the rest are by the Editors.
CAMBRIDGE: PRINTED BY C. J. CLAY, M.A., AND SON, AT THE UNIVERSITY PRESS.
TRANSCRIBER'S NOTES:Hyphens were spaced in ranges of small numbers to ease readability, e.g.,“1/2000-1/3000 of an inch”was changed to“1/2000 - 1/3000 of an inch”.Raised dots in numbers were converted to decimals.Use of periods and commas in the abbreviations within and referring to figures and plates is inconsistent. Often, punctuation marks do not match the illustrations to which they refer. Periods were retained; commas were added to separate figure numbers from abbreviations within the figure. Spacing within the abbreviations was standardized.Footnotes were renumbered sequentially, and were moved to the end of the chapter. There is no anchor for footnote 496; anchor was placed at the spot the transcriber deemed it likely belonged. Footnote 351 incorrectly identifies the page number of the article on urinogential organs of vertebrates. The number provided in the original text of the footnote was retained, but the link was corrected.Changes for consistency within the text of the book:body cavity to body-cavitybody wall to body-wallchoroid-slit to choroid slitdevelope(s) to develop(s)dog fish to dog-fishElasmobranchs to ElasmobranchiiEntwickelung to Entwicklunghead-fold to head foldinter-renal to interrenaljuxta-position to juxtapositionlenslike to lens-likere-agent(s) to reagent(s)omphalo-meseraic to omphalomeseraicpleuroperitoneal to pleuro-peritonealproto-vertebra(æ) to protovertebra(æ)re-appear to reappearsemi-lunar to semilunarside-fold to side foldspongework to sponge-worksubgerminal to sub-germinalsub-intestinal to subintestinalsub-kingdom to subkingdomsub-notochordal to subnotochordalsuboesophageal to sub-oesophagealsupraoesophageal to supra-oesophagealurino-genital to urinogenitalUrogenital-system to Urogenitalsystem, except where cited as a title of a work.Verwandschaft to Verwandtschaftwidespread to wide-spreadwood-cut(s) to woodcut(s)zool. zoot. to zool.-zoot.italics removed from eight instances of“vide”italics, where missing, were added toloc. cit.,i.e.ande.g.Other changes:[TN1]changed from 'reremainder'[TN2]changed from 'on'[TN3]changed from 'splachnopleure'[TN4]changed from 'Sitzen.'[TN5]changed from 'diffiulty'[TN6]changed from 'it'[TN7]changed from 'primive'[TN8]and[TN10]changed from 'opthalmicus'[TN9]Figure number is missing in the original.[TN11]changed from 'Ureierernester'[TN12]changed from 'vascula'[TN13]changed from 'Metozoa'[TN14]duplicate word 'of' removed[TN15]changed from 'protodæum'[TN16]changed from 'is it'[TN17]changed from 'is is'[TN18]changed from 'continous'[TN19]changed from 'Zussammenhang'[TN20]changed from 'Tranverse'[TN21]changed from 'odontophor'[TN22]changed from 'lens'[TN23]changed from 'Platyelminthes'
TRANSCRIBER'S NOTES:
Hyphens were spaced in ranges of small numbers to ease readability, e.g.,“1/2000-1/3000 of an inch”was changed to“1/2000 - 1/3000 of an inch”.
Raised dots in numbers were converted to decimals.
Use of periods and commas in the abbreviations within and referring to figures and plates is inconsistent. Often, punctuation marks do not match the illustrations to which they refer. Periods were retained; commas were added to separate figure numbers from abbreviations within the figure. Spacing within the abbreviations was standardized.
Footnotes were renumbered sequentially, and were moved to the end of the chapter. There is no anchor for footnote 496; anchor was placed at the spot the transcriber deemed it likely belonged. Footnote 351 incorrectly identifies the page number of the article on urinogential organs of vertebrates. The number provided in the original text of the footnote was retained, but the link was corrected.
Changes for consistency within the text of the book:
body cavity to body-cavity
body wall to body-wall
choroid-slit to choroid slit
develope(s) to develop(s)
dog fish to dog-fish
Elasmobranchs to Elasmobranchii
Entwickelung to Entwicklung
head-fold to head fold
inter-renal to interrenal
juxta-position to juxtaposition
lenslike to lens-like
re-agent(s) to reagent(s)
omphalo-meseraic to omphalomeseraic
pleuroperitoneal to pleuro-peritoneal
proto-vertebra(æ) to protovertebra(æ)
re-appear to reappear
semi-lunar to semilunar
side-fold to side fold
spongework to sponge-work
subgerminal to sub-germinal
sub-intestinal to subintestinal
sub-kingdom to subkingdom
sub-notochordal to subnotochordal
suboesophageal to sub-oesophageal
supraoesophageal to supra-oesophageal
urino-genital to urinogenital
Urogenital-system to Urogenitalsystem, except where cited as a title of a work.
Verwandschaft to Verwandtschaft
widespread to wide-spread
wood-cut(s) to woodcut(s)
zool. zoot. to zool.-zoot.
italics removed from eight instances of“vide”
italics, where missing, were added toloc. cit.,i.e.ande.g.
Other changes:
[TN1]changed from 'reremainder'[TN2]changed from 'on'[TN3]changed from 'splachnopleure'[TN4]changed from 'Sitzen.'[TN5]changed from 'diffiulty'[TN6]changed from 'it'[TN7]changed from 'primive'[TN8]and[TN10]changed from 'opthalmicus'[TN9]Figure number is missing in the original.[TN11]changed from 'Ureierernester'[TN12]changed from 'vascula'[TN13]changed from 'Metozoa'[TN14]duplicate word 'of' removed[TN15]changed from 'protodæum'[TN16]changed from 'is it'[TN17]changed from 'is is'[TN18]changed from 'continous'[TN19]changed from 'Zussammenhang'[TN20]changed from 'Tranverse'[TN21]changed from 'odontophor'[TN22]changed from 'lens'[TN23]changed from 'Platyelminthes'