14G 



PROCEEDINGS OF THE ACADEMY OF 



[1881. 



Tomes, gives rise to the color. The length of the blood gland 

 measured -^^ of an inch, in width the :^^ of an inch, the length'of 



the duct -^Q of an inch. 

 In many parts of the skin 

 these glands are absent, 

 and when present are situ- 

 ated about the ^^ of an 

 inch below the surface, 



A most striking feature 

 in the skin of the Hippo- 

 potamus is the great de- 

 velopment of the fibrous 

 tissue of the corium. This 

 is disposed in great bands, 

 which are so interwoven 

 with each other as to give 

 the appearance of a fabric. 

 Rejections. — In conclu- 

 ding these observations, 

 it may not appear super- 

 fluous to briefly consider 

 what appears to me to be 

 the natural affinities of the Hippopotamus with the Ungulata or 

 other mammalia. In observing the Manatee that lived for several 

 months in the Philadelphia Zoological Garden, the manner in 

 which it rose to the surface of the water to breathe reminded me 

 often of the Hippopotami that I watched in the Zoological 

 Garden of London and the Jardin des Plantes in Paris. The 

 slow way in which the animals rise to the surface, the motionless 

 pose of the almost sunken body, the nostrils often just appearing 

 at the surface, etc., are very much alike in both animals. In 

 speaking of the alimentary canal, I called attention to the stomach 

 of the Manatee representing the stomach of the Hippopotamus in 

 an atrophied condition, while, on the other hand, the stomach of 

 the Hippopotamus is intermediate between the Peccary and the 

 Ruminants. As regards the heart, it will be remembered, that in 

 the 3"oung Hippopotamus, at least, it is bifid, resembling in tliis 

 respect that of the Manatee. The female generative apparatus of 

 the Peccary and Hippopotamus are almost identical. Again, the 

 sexual vesicles are found iai both Hippopotamus and Manatee. 



