MAMMALIA. 
147 
teriorly widened, having their edges provided with numerous 
teeth ; a single dorsal fin. 
Delphinus delpliis .— The Dolphin. 
Plate XXXIV. fig. 2. 
Jaws of equal length, moderately elongated ; from 42 to 45 
pointed and bent teeth in each jaw; dorsal fin placed nearer the 
tail than head; upper parts black; under parts grayish-white. 
Eight or ten feet long. Inhabits the seas of Europe. 
Sub-Genus 2. — Phocjena. —No beak; muzzle short and con¬ 
vex; jaws with numerous teeth ; having a dorsal fin. 
Delphinus grampus. — The Grampus. 
Colour bluish-black above, belly white; snout blunt and 
short, body and tail elongated. Length twenty-five feet. In¬ 
habits the North Atlantic. 
Sub-Genus 3. — Delphinopterus. — Lacepede. — Head ob¬ 
tuse ; muzzle beak-formed, not elongated; number of teeth 
middling; without dorsal fin. 
Delphinus leucas .— The Beluga. 
Plate XXXIV. fig. 5. 
Head like that of the porpoise, teeth short, blunt, nine on 
each side in both jaws ; instead of a fin, a small dorsal emi¬ 
nence ; colour yellowish-white. From twelve to eighteen feet 
long. Inhabits the Northern Seas. 
Sub-Genus 4. — Heterodox. — Lacepede. — One tooth in 
each jaw, sometimes none ; lower jaw larger than the upper. 
Delphinus heterodon. — The Hornfleur Dolphin. 
Head round, terminated by a round depressed beak; no teeth ; 
palate supplied with small points, or false teeth; lower jaw very 
thick in proportion to the upper one ; spiracle orifice semilunar ; 
m 2 
