MAMMALIA. 
145 
tusks in the upper jaw ; two pectoral teats ; mustachios ; nos¬ 
trils, properly so called, placed at the end of the muzzle; nasal 
apertures situated in the upper part of the head; body massive. 
Genus 1.— Manatus. — Linnceus. 
Generic Character. —Incisors 2 , no canines, grinders 9-9 , to¬ 
tal 38. The incisory teeth are very small, and exist in the 
foetus only; adults having only 32 teeth, four of the molars be¬ 
ing lost while young; grinders with two transverse inflated 
ridges ; head not distinct from the body; mustachios formed by 
a bundle of very stiff hairs directed downwards, forming a kind 
of corneous tusk on each side ; eyes very small; tongue oval; 
on the margins of the pectoral fins are rudimentary nails; cer¬ 
vical vertebrae six; sixteen pairs of thick ribs. 
Manatus Senegalensis _ The Senegal Manatus. 
Plate XXXIV. %. 1. 
Head short; breadth of nasal foramina equal to three-fourths 
of their length ; inferior margin of lower jaw curved; skin dark 
gray. About eight feet long. Inhabits the Senegal river, 
Africa. 
Genus 2. — Halicore.— Cuvier. 
Generic Character .—Incisors no canines, grinders £-3. to- 
tal 14, in the adult; but in the young the incisors are no ca¬ 
nines, grinders $-5 ; total 32. Two upper incisory teeth cylin¬ 
drical, straight, forming real tusks ; grinders cylindrical, adults 
having only three on each side-, body pisciform, terminated by 
a horizontal two-lobed fin ; muzzle truncated and moveable; lips 
with thick spiny hairs; tongue soft; fins short; no distinct fin¬ 
gers or nails ; cervical vertebrae seven ; eighteen pairs of ribs. 
Halicore Indica. — The Dugong. 
Upper jaw with two short straight tusks, directed obliquely 
downwards ; lips gross, spinous ; tail bilobate ; of a bluish-gray 
colour. Seven or eight feet long. Inhabits the Indian Seas. 
M 
