BY JAS. P. HILL. 59' 



Description of Specimens i.-ix. 



1. P. nasuta with two new-born young (g.l. 14 mm.). 



The genital organs of this specimen were described in my pre- 

 vious paper (p. 42o et seq., and fig. 25, Plate 32). The allantoic 

 stalks, one from each uterus, were shown to extend down froui 

 the placental areas, not into the lateral vaginal canals but into a 

 cleft-like passage, — the median pseudo-vaginal passage — for a 

 distance of about 3 cm. The allantoic stalks were already in 

 process of histological degeneration, the cells appearing mostly as 

 clear spaces with nuclei staining deeply and homogeneously, and 

 often irregular in shape. 



A section through the urogenital strand is figured on Plate 33, 

 fig. 35, and shows the two degenerating allantoic stalks in position 

 in the cleft-like passage in the connective tissue between the 

 lateral vaginal canals. The walls of the pseudo-vaginal passage 

 " are entirely formed Ijy the connective tissue core of the strand 

 and they exhibit no histological differentiation into coats, muscular 

 or other" (p. 427). Masses of coagulated blood were pre.sent in 

 the passaofe and extravasated blood was also abundantly present 

 in the surrounding connective tissue, the whole appearance of the 

 passage and its surroundings strongly suggesting that an extensive 

 rupture of the connective tissue and its contained vessels had 

 taken place along the line of passage of the embryo, i.e., the 

 pseudo-vaginal passage. 



ii. P. ohesida, with two 17 '5 mm. young in pouch. 



Sections through the uterus show that the mucosa has almost 

 regained its normal condition. The uterine epithelium forms a 

 complete layer of low cubical cells. The cavity of the uterus 

 contains a cellular detritus containing leucocytes and red blood 

 corpuscles. In sections through the mid-portion of one of the 

 uteri, two allantoic stalks are present, but disappear further back. 

 They have evidently been broken across, for they reappear, 

 curiously enough, in the cavity of one of the vaginal cpeca, and 

 from there pass down through the anterior forwardly directed 



