ORDER CETACEA. 449 



teeth of the Ornithorhyncus and Orycteropus — the triturat- 

 ing surface is unequal, and hollowed with tortuous furrows, 

 intended to facilitate mastication. 



The tail diminishes from the anus to the fin which 

 terminates it, and the apophyses of its vertebrae render it 

 almost quadrangular. 



The fin is about seventy-eight inches broad, and only 

 seven long, which is quite the reverse of that of the true 

 Lamantin. In Steller's animal too, it has the figure of a 

 crescent, and is terminated on each side by a long horn. 



The fins have their shoulder-blade, humerus, bones of 

 the fore-arm, carpus and metacarpus, but there are no 

 vestiges of nails, or phalanges ; the stomach is simple ; 

 the oesophagus inverted in the middle, and a thick gland 

 placed near this invertion pours juices into it through 

 numerous and wide pores. 



The intestines very much resemble those of a horse ; the 

 caecum is enormous, and as well as the colon is divided 

 into large inflated portions by its ligaments ; the bones of 

 the nose articulate one with the other, as in animals in 

 general. 



The pelvis is composed of two ossa innominata similar 

 in some respects to the cubitus of man, attached on one by 

 means of strong ligaments, to the twenty-fifth vertebra, on 

 the other, to the os pubis. 



There are six vertebras in the neck, nineteen in the back, 

 and five and thirty in the tail. 



This animal does not eat terrestrial herbs like the 

 Lamantin, but on\y fucus. 



Steller observed this animal in the North Pacific. 



The Lamantins seen by Dampier at New Holland and 

 Mindanao, are referred by Pennant and Shaw to this 

 genus. But it is more than probable, that they belong to 

 the Dugong. 



Fabricius assures us, that he found in Groenland a cra- 

 nium with dentary bones like those described by Steller. 



