1893.] NATURAL SCIENCES OF PHILADELPHIA. 187 



Gratiolet, Milne-Edwards in favor of distinguishing Choeropsis as a 

 genus distinct from Hippopotamus, there is but little further to be 

 added. It may be mentioned, however, in this connection, that the 

 brain of Choeropsis as described by Macalister 15 differs very con- 

 siderably from that of the adult hippopotamus dissected by Garrod 16 

 and of the young animal dissected by the author, 17 the differences 

 between the two brains being essentially the same as those presented 

 by the casts of the cranial cavities described and figured by 

 Milne-Edwards. The above remarks are made on the occasion 

 of the presentation to the Academy by Mr. W. E. Rothery, Consul 

 of the Liberian Government, through Mr. Arthur E. Brown, of 

 a fine skin and skeleton of the Choeropsis liberiensis. The value 

 of this generous gift will be better appreciated when it is known 

 that the only specimen of Choeropsis liberiensis ever exhibited 

 abroad was the one that lived only five minutes after its arrival 

 at the Zoological Garden of Dublin, and which constituted the 

 subject of the dissection made of that animal by Macalister. So 

 far as known to the author, with the exception of the skin presented 

 to the Academy this evening, there are but two others in col- 

 lections — those referred to by Milne-Edwards and Flower. Our 

 Choeropsis, of which we give an illustration taken from a photo- 

 graph, (Plate IV) is 5 feet 3 inches in length, and 2 feet 5 inches in 

 height, the latter measurement being taken from the shoulder. 

 The color of the skin appears to have been originally of a bluish 

 black, fainter in some parts than others, and presenting, therefore, a 

 somewhat mottled appearance. The difference in color from that of 

 the Choeropsis described by Milne-Edwards, which is represented 

 as of a reddish hue, may possibly have been due to the liquor in 

 which the skin was preserved. It is more probable, however, that 

 Choeropsis varies in color. In other respects, our specimen resembles 

 that described and illustrated by Milne-Edwards. 



15 Proc. Royal Irish Acad., 2d Ser, Vol. 1, 1873, p. 494. 



16 Trans, of Z. S. London, 1880. 



17 P. A. N. S., 1881, p. 126. 



