60 CLASS MAMMALIA. 



the body, but differ much in the head and teeth, 

 Their lower jaw wants incisors and canine teeth, and 

 takes in front a compressed form that it may be 

 placed between two enormous canines, or rather 

 tusks, which grow from the upper jaw, and are di- 

 rected towards the lower, being sometimes nearly 

 two feet in length and of a proportionable thickness. 

 The enormous size of the alveolars necessary to form 

 a lodgment for canines of this description elevates 

 the top of the upper jaw in the form of a large in- 

 flated muzzle, and the nostrils are nearly directed 

 upwards, and do not terminate the snout. The 

 molars have all the figure of short and obliquely 

 truncated cylinders. Four are reckoned on each 

 side, above and below ; but at a certain age two of 

 the upper ones fall out. Between the two canines 

 are, moreover, two incisors, like the molars, and 

 which the generality of writers have not recognised 

 to be incisors, though they are inserted in the inter- 

 maxillary bone. Between them are also two small 

 and pointed ones in young individuals. 



The stomach and intestines of the morses are 

 pretty much the same with those of the seals. It 

 would seem that they are sustained as well on fuci 

 as on animal substances. 



But one species has been as yet distinguished, 

 which is called* The Sea-Cow, Sea-Horse, Great 

 Toothed Beast, &c. 



* Shaw suspects that there may be two distinguished by tusks 

 more or less thick and more or less convergent. 



