Figs. 34-39. Five young embryos of _Peripatus capensis_; ventral view. All,
excepting Fig. 37, from drawings by Miss Balfour. In figures 34 to 38_a_
denotes 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 of _Peripatus capensis_. I could not tell for certain which was the
anterior end. Length, 1.34 mm."
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 of _Peripatus 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.
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