Mammalia. • 235 



Genus Manatus. Linnceus. 



Incisors §, canines oo' molars 1% — 38. The incisors exist only in 

 thefcetus, and the adulls have hut 32 teeth, four of the molars 

 fallir.g out in early age; molars with (too transverse cushions on 

 thfir crown; head not distinct from the body; eyes very small; 

 tongue oval: vestiges of nads on the margin of the pectoral fins ; 

 SIX cervical vertebra ; sixteen pairs of thick ribs; mustaches com- 

 posed oj a bundle of very strong hairs directed downwards, and 

 forming on each side a tiiud of corneous tusk. 



Manatus Snnegalensis, Desm. (Senegal Laniintin.) General 

 colour asliy-lilac ; head bony, sliort in proportion to its breadth^ 

 breadth of nasal foiamina tlirec-fourlhs of their length ; inferior 

 margin of lower jaw curved; smaller than the American Lauian- 

 tin. About eight feet long. 



Inhabits the mouth of the Senegal. 



Trichecus Australis, Shaw. Lamantin du Senegal, Adan- 

 8on, Voyage. 



Genus Halicore. Cuvier. 



Incisors |, canines 8 §, violars f §, — 14. In early aae, incisors 

 I- canines S §, molars § i, — 32. Two of the upper incisors cylin-' 

 drical and straight, f 01 ming tusks; molars cylindrical, and only 

 three- on each side in I he adulls; body pisci/orm, terminated by 

 a horizontal fa with two lobes; head not distinct from the body ; 

 vnuzzle truncated and moveable, with thick spiny hairs on the 

 tdges of the lips; tongue soft; fins short, without distinct fingers 

 or nails: seven cervical vertebrce ; eighteen pairs of ribs. 



Halicore Indicus, Desm. Head rounded towards the top, 

 ■oblique from the forehead to the muzzle, which last is vertical 

 and terminates abruptly. This part of the face is formed by 

 the upper lip, which hangs from each side of the' mouth form- 

 ing these two mobile and fleshy pendants which cover a part of v 

 the lower jaw laterally. These are set with small coineous 

 spines about an inch long; between these is a slope in front of 

 the upper jaw which receives the extremity of the lower, above 

 which the points of the tusks are perceptible on each side. The 

 interior of these lips is furnished with corneous warts. The 

 nostrils form two parabolic clifts approximating at the upper 

 extremity of the muzzle ; the opening of the car is very small, 

 and there is no external conch ; the eyes arc simple and small ; 

 the fins show no vestiges of nails, but have warty callosities 

 andernoath at their external 'edge ; the tail is horizontally 

 sloped or cut like the arch of a circle'; the body is wider at the \ 

 middle than the extremities, and the jrart towards the tail is 



