348 EDENTATA. 



very limited common cavity of the uterus so defined had a length of little more 

 than C-75 and a similar maximum breadth. The length from the free border 

 defining the entrance to the lelt unfecundated horn to the wall of the right horn 

 facing the os uteri internum was 4''*25. The left horn thus appeared as a diverti- 

 culum from the lower portion of the cavity, from which it passed off as 

 a wide channel, the orifice being one inch in breadth from side to side. The 

 septum between the two horns was V^'26 broad, with a maximum depth of 

 2'^"50, and it corresponded to the septum of the uterus of Orca gladiator de- 

 scribed by Turner.^ A part, however, of the external wall of the left horn at 

 its beginning, and which in the unfecundated uterus had been within the lips 

 of the entrance to the horn, entered into the formation of the cavity containing 

 the foetus, but all the remainder of the left horn was excluded. The latter 

 horn, as in such two-horned uteri generally, had become considerably enlarged 

 during the gravid condition, but it had not attained to one-half the dimensions of 

 the other horn. The portion of the cavity around the os uteri internum was slightly 

 dilated on its dorsal surface. The form and relations of the two cornua of this 

 gravid uterus of Manis pentadactyla were thus exactly the same as in the gravid 

 uteri of Tlatanista and Orcella figured and described in this work. I mention this 

 because Prof. Turner ^ has described in the membranes of the Manis, originally 

 examined by Sharpey, the existence of " two pouch-like recesses about the size of 

 walnuts, one situated at each lateral extremity of the transversely elongated uterus." 

 The foetus which had arrived almost at maturity had unfortunately escaped by a 

 rupture of the uterine wall at the Eallopian pole of the right horn. The membranes 

 were, however, left investing the uterine cavity, and on laying open the uterine 

 wall along its dorsal surface as far as the os uteri internum, the chorion was found 

 closely adhering to the inner surface of the uterus and sending up a prolongation 

 into the left horn, and from the point where this portion turned off into the left horn, 

 another well-defined sac depended into the section of the cavity above and around 

 the OS uteri internum, but when the membranes were inflated with water, this sac 

 was seen to be directly continuous with the portion of the membranes investing the 

 gravid horn. The relations, therefore, of the membranes to the uterine wall were 

 the same as those of the uterine membranes of the Equidce, Uliinocerotidce 

 TapiridcB, CamelidcB, and Cetacea. 



On gently removing the chorion, it was found that the villi covering its surface 

 were impacted in the spongy tissue which clothed the uterine wall ; slight traction 

 being exercised, they were drawn out of the investing glandular substance. As in the 

 uteri of Tlatanista Orcella, and other diffuse placenta generally, bare areas occurred 

 perfectly destitute of villi, and opposite to these bare spaces the surface of the 

 chorion was deprived of villi ; but I am not prepared to say that no bare space may 

 not have had a few chorionic villi opposed to it. As is well known, these bare spots on 

 the chorion of Manis were first described by Sharpey.^ On removing the entire 



1 L. c, p. 473. 2 Trans. Eoy. Soc. Edin. vol. xxvii. 1873, p. 91. 



3 Elements of Comp. Anat. (Huxley), 1864, p. 112. 



