430 PHYSIOLOGY OF THE INVERTEBRATA. 



side of the rectum. Like the testes, the ovary is situated in 

 the posterior end of the body. It is a small, single, bilobed 

 organ provided with two long oviducts, which unite before 

 passing into a short vagina. The vagina opens externally on 

 the ventral side of the rectum. The oviducts are provided 

 with uterine dilatations, and in these the ova are developed, 

 Peripatus being a viviparous animal. For details concerning 

 the development of Peripatus, the reader is referred to 

 Moseley's original paper, already cited. 



The Myriapoda. 



The Myriapoda are dioecious. The testes, in the CMlopoda, 

 assume various forms ; but in most of these animals, the testes 

 are said to be " fusiform acini united by delicate ducts with a 

 median vas deferens ; and two, or four, pairs of accessory 

 glands are connected with the opening of the male apparatus." 

 According to Pavre,* the testis, in Zithohius, is a single tube 

 connected with the vas deferentia, the latter being situated 

 on each side of the rectum. A vesicula seminalis opens into 

 each vas deferens. 



In the ChUognatha (Diplopoda), the tubular testes are 

 situated between the alimentary canal and the nervous 

 system. The testes are provided with lateral tubules, the 

 former being connected with the latter by transverse ducts. 

 There are two penes connected with the bases of the seventh 

 pair of legs. In Scolopendra (centipede), GeopMlus, and 

 Crypiops, the spermatozoa are enclosed in spermatophores. 



In both the Gliilopoda and ChUognatha, the ovary is a long 

 single tube. It is situated above the alimentary canal in the 

 CMlopoda, and between the alimentary canal and the nervous 

 system in the ChUognatha. The female organ in each order 

 is provided with double vagina, which open beneath the anus 

 in the CMlopoda, and behind the bases of the second pair of 

 legs in the ChUognatha. Two spermathecae are generally 

 present in the Myriapoda. 



* Annales des Sciinces Katurelles, 1855. 



