On a supposed New Species of Hippopotamus. 407 



Hippopotamus minor. 



. 4 2—2 ^ . 1—1 



Incisors, — or ; UanineSj 



Dental Formula : 



False Molars, ; Molars, -H^ 



' 4—4' ' 3—3 



Length of the skull, measured from the anterior ex- 

 tremity to the notch between the condyles of the inches. 

 occipital bone, - ------ 12-3 



Zygomatic diameter, - ------8- 



Parietal diameter, -- - - - - - 3-5 



Distance between the orbits over the surface of the 



skull, 3-9 



Vertical diameter of orbit, ----- - 2* 



Horizontal diameter of orbit, ----- 1-8 



These measurements have been taken from a very old indi- 

 vidual, in which the sutures are entirely obsolete, and the teeth 

 worn almost to the level of the jaw ; and the contrast in size, be- 

 tween this and the large or common species, (familiar to every 

 one as the H. amphibius, but recently divided into two species, 

 the H. capensis and H. Senegalensis,) will be manifest to every 

 one. The difference, however, is not only in size, but in all the 

 proportions of the head, as the subjoined drawings will show. 



Fig. 1. Fig. 2. 





z/zMmmsskif!^'"" jiijiB ^-^^'^mm m ||\\iiy| ^ 



' im^^.\.^ &■■ #. 



mm 



In the H. minor there is a uniform convexity of the upper sur- 

 face of the cranium, from orbit to orbit, and between the occiput 

 and ossa nasi ; while in the common species the orbits are re- 

 markably elevated, and the intermediate surface is concave. The 



