THE AX ATOMY AST) DEVELOPMENT OE PERIPATUS XOVAE-BRTCaISATaE. H 



New Britain species and from the Cape and Australasian forms. The ovarian tabes 

 in the subgenus Peripatus (see above, p. 3» hare thick walls comprised. aee»;-rding to 

 Cratrron. of exactly the same layers as the uterine wall, namely, peritoneal inii 4mm at. 

 tunica muscularis, tunica propria and [germinal] en i lh i 'limn The ova naUue ta sit* 

 (Test-figure 2) and make low projections towards the lumen of the ovarian tube, the 

 basal membrane (tunica propria) of the »t i iniiiil t pilhi liiiai maintaining its even coarse 

 below the ova. They may be called "epithelial ova in "^fwti mil' ilinrtnin to the 

 ■ follicular ova ; ' of the other forms. 



In the other three subgenera (see p 3> the wall of the ovarian tabes is thin 

 and the ova do not retain their epithelial p""*»"» during maturation, but they cause 

 the wall of the ovary to project in the form of follicles which are attached to the 

 ovary by longer or shorter stalks and hang freely into the central division of the 

 body-cavity (haemocoel) (Fig. 18V In P. mamma hi ikmmiae I do not rind a tunica 

 muscularis distinct from the peritoneal investment of the ovary, and there is no 

 regular tunica propria. In these respects, the present species resembles P. eapemtit 

 and P. nome-sealandiae (Sheldon 21 . 



These tacts have their bearing on the interpretation of the morphological character 

 of the ovarian tubes themselves. It is possible that these are not strictly homologous 

 structures throughout the genus Peripatus <see below, section on Receptaculum ovorumV. 



The ova of our species contain granular protoplasm and are wichout yolk : when 

 fully formed they measure about -11 mm in diameter. In point of size they are 

 therefore intermediate between the Neotropical and the Cape species. 



Receptactla seminis. The infundibuliform oviducts, which have the shape of ram's 

 horns, lead direct from the ovary to the corresponding receptacula seminis. 



Before reaching the receptaculum gpmTnis^ each oviduct communicates by a short 

 canal with the uterus. In Fig. 17, this cross-way has the appearance of being a 

 secondary connection. Gaffron (6) has described the origin of the receptaculum 

 seminis by a looping up of the genital duct, the two folds which combined to produce 



Fig. 3. Dugbjlm to nxrsTSAn tee hope of romnncs cr a szjsjta:— nt aa— wrrn its two MCB. 



[Simplired after Giir.-^.' 



In A the oviduct is simply looped. 



In B the convex ponion of the loop Lis begun to eLir^ i=i :o cs^e L.-ce-'-iie ?: ;#c:..-->. 

 In C the angles of the loop have met and fused. 



the loop then fusing together, so that the lumen of the duct becomes continuous 

 past the receptaculum seminis with which it is connected by two ducts tText-tigure o>. 



