RY J AS. P. HIM,. 531 



In the sections practically the only trace of the pseudo-vaginal 

 passage now present is a slight condensation in the connective 

 tissue in the direct line of continuation of the median vagina, 

 and distinguishable by its more deeply staining qualities. From 

 the condition in this set of organs it would be quite impossible 

 to foretell the existence of a pseudo-vaginal passage in Tricho- 

 surus. In this connection it may be noted that in Dasyurus, as 

 I have elsewhere described, on the third day after parturition, 

 the pseudo-vaginal passage has completely healed up, and practi- 

 cally all trace of it has disappeared. In these two forms then, as 

 in Perameles, the pseudo-vaginal passage must be reformed anew 

 at each succeeding act of parturition. 



Trichosurus is the first Diprotodont genus in which a pseudo- 

 vaginal passage has certainly been found to exist, and its occur- 

 rence in a member of this suborder supports, it seems to me, the 

 view put forward in Contribution I, of the origin of the direct 

 post-partum communication between the median vagina and the 

 urogenital sinus as it exists in the majority of the Macropodidrr, 

 and it further renders the suggested occurrence of a pseudo- 

 vaginal passage in M. major all the more probable. 



ERRATUM. 



In Contribution I (Proceedings, 1899, Part i.), on page 49, third line from 

 bottom, and on page 51, third line from top— />»■ fundus read neek. 



EXPLANATION OF PLATES. 



Reference letters. 



a.g. Anal gland, a.vag.c. Anterior forwardly directed portion of lateral 

 vaginal canal, bl. Bladder, cl.o. Cloacal opening. Jim. Fimbriated open- 

 ing of Fallopian tube, f.t. Fallopian tube, l.vag.c. Lateral vaginal canal. 

 m.r.c. Median vaginal canal. ov. Ovary. rect. Rectum. ur. Ureter. 

 weth. Urethra, ut. Body of uterus, itt.n. Uterine neck. 



