58 



SPECIMENS OP THE HIPPOPOTAMUS and other 



greater concavity of the head between the orbits, and the more rapid rise 

 of the ridge : this specimen is also much cracked and consequently could 

 not be altogether cleared of matrix. ^';nrt^n 



Another specimen in our collection (omitted for want of room in the 

 engraving) has, in general form and degree of preservation, a resemblance 

 to Fig. 1, of PI. VI. It is from the head of an aged animal : the roots of 

 the canines are visible and present a heart-shaped section. There is 

 however much ditierence between the two ; the most striking dissimilarities 

 are the insertion and start of the canines, which attest shorter nasal bones 

 to have belonged to this species ; the shape and prominence of the 

 orbits ; and the greater concavity of interorbital space. The specimen 

 under consideration, has a nearer resemblance to Fig. 1, of PI. V, but 

 belonged to a somewhat smaller animal. 



Fig. 2, PI. VI, is given as shewing distinctly the sutures, which dis- 

 agree in several points with those of species hitherto described, both as 

 existing or in a fossil state. 



Fig. 1, PI. VI, may be considered as one species ; Fig. 1, PI. V, and 

 Fig. 2, PL VI, as having belonged to another species possessing the cardi- 

 form canines of which so many fragments are disinterred. 



Fig. 12, a, b, c, PI. VII, belonged to a small Hippopotamus, and 

 presents two peculiarities — ^Ist, the great breadth of its ridge as shewn in 

 Fig. 12, a. 2ndly. — The depth of its occipital condyles, which is greater 

 in proportion to the height of the occiput, than those of the large 

 Hippopotamus. 



Fig. 12, PI. VII, though possessing the peculiarities above noticed, 

 affords too narrow grounds for the establishment of a separate species. 



The lower jaws agree in one respect, namely that of all having six 

 incisors, in this differing from the existing and fossil species hitherto 

 described. 



The upper jaws have the proportion between the external breadth of 

 their occipital condyles and the breadth at their orbits similar to that 



