432 CLASS MAMMALIA. 



The Dugongs, Lacep. (Halicore, Mig.) 



The cheek-teeth are composed each of two cones 

 united at the side. The teeth implanted in the in- 

 cisive bone are preserved, and grow to such an 

 extent as to become genuine pointed tusks ; but 

 they remain in a great measure covered by fleshy 

 lips which bristle with mustachios. The body is 

 elongated, and the tail terminated by a fin in the 

 form of a crescent. 



But one species is known, which inhabits the 

 Indian Sea, and which many travellers have 

 confounded with the Lamantin. 



This has also been called the Siren, Sea- 

 cow, (Renard, poissdes Indes, pi. xxxiv.,/. 180.) 



The Stelleres, Cuv. (Rytina, Elig.) 



Appear to have on each side only a single cheek 

 tooth with flat coronal, and bristling with plates of 

 enamel. Their fins have not those little claws ob- 

 servable on the Manatis ; and according to Steller, 

 who first described them, their stomach is also 

 much more simple. 



One species only is known, which is found in 

 the north part of the Pacific Ocean. 

 The second family, or 



The Common Cetacea, 



Are distinguished from the preceding by that sin- 

 gular apparatus called spiracles. As they swallow 

 with their prey an immense quantity of water, some 



