MALE.—The male organs (Fig. 12) consist of a pair of testes (_te_), a pair of vesicles (_v_), vasa deferentia (_v.d_), and accessory glandular tubules (_f_). All the above parts lie in the central compartment of the body cavity. In _P. capensis_ the accessory glandular bodies or crural glands of the last (17th) pair of legs are enlarged and prolonged into an elongated tube placed in the lateral compartment of the body cavity (_a.g_). [Illustration: FIG. 12.—Male generative organs of _Peripatus capensis_, viewed from the dorsal surface. (After 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 the vasa deferentia open; _te_, testis; _v_, seminal vesicle; _v.c_, nerve-cord; _v.d_, vas deferens.] The right vas deferens passes under both nerve-cords to join the left, and form the enlarged tube (_p_), which, passing beneath the nerve-cord of its side, runs to the external orifice. The enlarged terminal portion possesses thick muscular walls, and possibly constitutes a spermatophore maker, as has been shown to be the case in _P. N. Zealandiae_, by Moseley. In some specimens a different arrangement obtains, in that the left vas deferens passes under both nerve-cords to join the right. FEMALE.—The ovaries consist of a pair of tubes closely applied together, and continued posteriorly into the oviducts. The oviducts, after a short course, become dilated into the uteruses, which join behind and open to the exterior by a median {19}opening. The ovaries always contain spermatozoa, some of which project through the ovarian wall into the body cavity. Spermatozoa are not found in the uterus and oviducts, and it appears probable that they reach the ovary directly by boring through the skin and traversing the body cavity.[6] In the neotropical species there is a globular receptaculum seminis opening by two short ducts close together into the oviduct, and there is a small receptaculum ovorum with extremely thin walls opening into the oviduct by a short duct just in front of the receptaculum seminis. The epithelium of the latter structure is clothed with actively moving cilia. In the New Zealand species there is a receptaculum seminis with two ducts, but the receptacula ovorum has not been seen. There appear to be present in most, if not all, the legs some accessory glandular structures opening just externally to the nephridia. They are called the crural glands. DEVELOPMENT.