TWO NEW SFKUIES OF OiNYOHOPHOUA. 507 



and oviducts as being' developed from the genital somite 

 alone in the genus Peri pat us. 



It is quite possible tliat tliere is a difference in this respect 

 in the Peripatidae ; but it is necessiiry to point out that the 

 position of the ovary in the adult of tlie genus Peripatus, as 

 well as of other genera, tends to show that Kennel is in error, 

 for the ovary is located in the pra3g-eiiital segment, just where 

 we should expect to "find it had it been developed from the 

 dorsal portion of a prasgenital somite. If this be so, the 

 ovary with its oviduct is a composite structure even in the 

 genus Peripatus, as is certainly the case in the genus Peri- 

 patopsis. But, though Kennel niay be in error in deriving 

 the ovary from the genital somite alone in the genus Peri- 

 patus, it is highly improbable that it is formed from as many 

 somites as in the genus Peripatopsis; for to make a mistake 

 with regard to one somite is quite different from falling into 

 error regarding six somites. It would seem that there is a 

 difference between Peripatopsis and Peripatus in this 

 respect; a difference wnich points to the possible participa- 

 tion of a great number of somites in the formation of the 

 ovary in the ancestral Peripatus. In the genus Eoperi- 

 patus the ovary is formed from the dorsal portion of the 

 four pairs of somites situated immediately in front of the 

 genital segment, which, it would seem, takes no part in the 

 formation of the ovary. 



The Uteri : — This term is applied to the main part of the 

 generative ducts, that part which extends from the receptacula 

 serainis to the vagina, and contains the developing embryos, 

 if there are any. The uteri present no constant arrange- 

 ment, and it is impossible to say whether any particular one 

 is predominant. In the specimens shown in figs. 22 and 23, 

 the arrangements are exceedingly different. In both cases 

 the uteri contain a number of embryos. In the specimen 

 shown in fig. 22, the oldest embryo in the left uterus is on 

 the right side, and the one in the right uterus is on the left 

 side — a result brought about by the crossing of the uteri close 

 to the vagina. 



