146 
MAMMALIA. 
Genus 3. — Stellerus. — Cuvier. 
Generic Character .—Devoid of incisory or canine teeth, grin¬ 
ders J—J; total 4. Teeth not implanted in the jaws, but at¬ 
tached to a molar plate on each side, by vessels and nerves; 
grinders with tortuous surfaces ; body ventricose towards its 
centre, gradually diminishing towards its caudal extremity, which 
is luniform, with two points; head obtuse ; lips double; no 
external ears, or appearance of a neck ; eyes surmounted by 
a cartilaginous crest; anterior extremities in the form of pal- 
mated fins. 
Stellerus borealis .— The Northern Stellera. 
Head round; without tusks or canines. Twenty-three feet 
long. Inhabits northern parts of the South Sea and North 
America. 
Family II —Cetacea. 
Teeth generally pointed, sometimes obtuse, all of one kind, 
and placed on the margins of the jaws; sometimes with trans¬ 
verse corneous laminse in the arch of the palate, in place of 
teeth ; two anal mammae; spiracles or nostrils opening at the 
top of the head, for the ejection of water; tongue smooth ; with¬ 
out hairs, eye-lashes, or mustachios. 
Tribe I. —Small-Headed Cetacea. 
Genus 4.—Delphinus.— Linnaeus. 
Generic Character. —Teeth all shaped like canines, com¬ 
pressed, and notched on their cutting margins ; varying in num¬ 
ber from 200 to none; jaws more or less protruded in form of 
a beak; aperture of spiracles luniform ; an adipose dorsal fin, 
with sometimes a longitudinal dorsal fold of skin; tail hori¬ 
zontally flattened and bifurcated. 
Sub-Genus 1.— Delphinus— Cuvier. —Muzzle elongated in¬ 
to a moderate beak; large at the base, point rounded ; jaws pos- 
