SPECIES OF MAMMALIA. 



short in proportion to breadth ; breadth of nasal foramina 

 equal to three-fourths of length ; zygomatic apophysis of 

 the temporal, slightly elevated ; lower edge of lower jaw 

 curved. About eight feet long. 



Lamantin du Senegal, Adanson's Voy. Dapper, Afric. 

 Trichecus Australis, S>haw, Gen. Zool. Buff. torn. xiii. 

 Suppl. torn yi. Cuv. Ann. Mus. Recher. Surless. Oss. Foss. 



Icon. Shaw. Oss. Foss. 



Manners unknown. 



Habitat. Mouth of the Senegal River, and other great 

 rivers of the western coast of Africa. 



Genus II. — Dugong. Halicore. Illig. 



Incisives (adult) f ; canines %\'^- ; molars f :;|.=: 14, (i/oung) 

 Incisives | ; canines ^:^ ; molars f :|. =: 32. Four upper in- 

 cisors, two of which cylindrical, strait and strong, form 

 real tusks ; two very small behind these, only found in the 

 young. Anterior face of the lower jaw truncated obliquely ; 

 eight alveoli on two lines, containing teeth never developed. 

 First molar in the adult cylindrical and worn obliquely, 

 and in a hollow at point ; second cylindrical, with flat coro- 

 nal; third formed of two cylindars united, and truncated 

 at top. Body pisciform, terminated by a horizontal fin, 

 with two lobes; head not distinct from body; muzzle 

 very thick, truncated, and mobile, furnished with very thick 

 spiny hairs on the edge of the lips; nostrils very small, 

 separated in front of the eyes ; eyes small ; tongue soft, 

 partly fixed ; fins short, without distinct fingers or claws ; 

 seven cervical vertebrae; eighteen pair of ribs; stomach 

 two pouches, and two cascal appendages ; heart bifurcated, 

 each ventricle forming a particular lobe; penis with volu- 

 minous and bifid gland. 



901. 3. H. Indicus (Dugong of Indian Seas.) General 



379 



