Fig. 33. Female generative organs of _Peripatus 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 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. [Illustration: PLATE 1. FMB. ed. nat. del. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.] [Illustration: PLATE 2. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]