February, 1844.] 15 



officiated as Colonial Physician; a situation which gave him 

 great advantages for procuring the natural productions of that 

 region. Among these crania were two of a Hippopotamus, of 

 small size, from the river St. Paul's. Although nothing could 

 be more manifest than the difference between the head of this 

 animal and that of the common species, I have hesitated to pub- 

 lish it, from a fear that some one else may already have done so; 

 for I could hardly convince myself that so remarkable a species 

 was wholly unnoticed in the systems. Having, however, searched 

 the latest European works on Zoology without finding any 

 account of this interesting animal, I venture to submit the follow- 

 ing facts in relation to it. 



Hippopotamus minor. 



4 2 2 • 1 1 



Incisors, — or ; Canines, . 



Dental Formula: 



False Molars, ' Molars, '_Z!L_ 



4—4 3—3 



Inches. 



Length of the skull, measured from the anterior ex- 

 tremity to the notch between the condyles of the 



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 



