I4») M)TKS ii.N MAU^l'l'lAl.lAN ANAToMV. 



Il is interrupted only by the incoming blood vessels. 

 There is a well marked serosa continuous with the broad 

 ligament. 



A comparison with the uterus of a female with pouch 

 voung (described in my last paper) shows that the chief 

 difference in the latter is the greater growth of the mucosa, 

 it being about one and a half times as thick. This increase 

 in growth takes place for the most part on the lateral walls 

 of the uleinis, forming here two large cushion-shape masses. 

 Other jjoints noticeable in the multiparous uterus are: — 

 The inner epithelium is entirely columnai-. the mucosa is 

 considerably more vascular, almost the entire space between 

 the uterine glands being taken up by vessels, the uterine 

 glands have increased in number and diameter, the muscu- 

 laxis has increased in thickness, and has become invaded to 

 seme extent by uterine glands. 



MEDIAN VAGINAL APPARATUS (SINUS 



VAGINALIS), 



The general arrangement and structure of this portion 

 of the female sexual organs of Sarcophilus is worthy of 

 considerable discussion. In my last communication, I 

 ventured the remark that the structui'e may not be present 

 in the virgin, but may arise at the time of the first preg- 

 nancy. I was led to this conclusion by the fact that in 

 the comparatively large and late pouch young described in 

 that communication no sign of the median vaginal appara- 

 tus, as such, was present; while in a pouch young of 

 Perameles, a section of whose organs was figured by Hill 

 (5, p. 77) there are indications that the foundation of the 

 median vaginae have already been laid. Van den Broek, 

 again, describes the presence of a well marked median 

 vaginal apparatus in a pouch young of Didclphys. for he 

 says: — "Dagcgen fand ich bei Beuteljungen von bidelphys 

 schon sehr fruh den Sinus Vaginalis in eincn Entwicklungs- 

 grad, der jenem des ei-wachsenen Tieres relativ wenig nach 

 stcht." this being quite the opposite to what had been 

 already described by Brass. I was also led to the abov&- 

 mentioned conclusion bv the peculiar irregnlar arrange- 

 ment of the two median va^nal cul-de-sacs with: regai-d to 

 the vaginae, and again by the fact that the anteriorly 

 directed portion in each median vaginal cul-de-sac is quite 

 narrow and canal-like, an occurrence which led me to 

 give it, for the time being, the special name of the median 



