82 FEMALE UROGENITAL ORGANS OF PERAMELES. 



Fig. 13, Plate vii., Figs. 14-15, Plate viii. — Trans, sections of P. obesula 

 with two 22 mm. young. In 13, the section passes through the 

 ant;erior portion of the common median vagina {c.m.r.); in 14, 

 through the anterior region of the pseudo-vaginal passage, 

 blocked up by three allantoic stalks (a//..y. ) ; and in 15, through 

 the mid-region of the urogenital strand, with the cleft-like 

 pseudo-vaginal passage (jn:p) containing detritus. 



Fig. 16, Plate xii. — Trans, section. Just behind the posterior end of the 

 common median vagina. P. obesula with four 3'7 cm. young. 



Fig. 17, Plate xi. — Trans, section. Showing the remnants of allantoic 

 stalks filling up the pseudo-vaginal passage and surrounded and 

 invaded by connective tissue. P. oliesu/a with 4 cm. young. 



Fig. 18, Plate viii., and Figs. 19 and 20, Plate ix. — Trans, sections, P. 

 nasuta (?) bred, showing in 18, the common median vagina (c.vi.v.) 

 in 19, a well marked example of a fibrosed allantoic stalk (al/..i.) 

 in the pseudo-vaginal passage, and in 20, the cleft-like passage 

 containing remnants of stalks. 



Fig. 21, Plate x. — Trans, section through the urogenital strand of P. obesula 

 with blastodermic vesicle in uterus. 



Fig, 22, Plate xii. — Trans, section, urogenital strand of P. obesula with 

 two 12"5mm. young in uteri, showing the vascular character of 

 the connective tissue {c.t.) between the lateral vaginal canals. 



