DELPHINUS. MAMMALIA. 163 



D. rostratus, Cuv. Desm. Snout long and slender, not depressed ; 

 teeth 22 to 26 on each side of the jaws, conical. Size of the 

 common dolphin. Seas of Europe. Mam. 515. 



Sub-Gen. 4. PHOO<ENA, Cuv. No beak ; snout short and gibbous ; 

 numerous teeth in both jaws ; a dorsal Jin. 



D. phoccena, Lin. The Porpoise. Body and tail elongated ; snout 

 rounded ; teeth compressed, from 22 to 25 in both jaws ; dorsal 

 fin near the middle of the body ; colour blackish above, white 

 below. Four to five feet long. Inhabits all seas. Shaw, ii. pi. 229. 



D. Peronii, Desm. Form and size of the porpoise ; back bluish- 

 black, the rest of the body bright white. Seas of Australasia. 



D. Commersonii, Desm. Form and proportions of the porpoise ; 

 body entirely of a silvery white, with the exception of the extre- 

 mity of the snout, the muzzle, tail, and fins, which are blackish. 

 A little larger than the porpoise. Off Cape Horn. Mam. 517- 



D. gladiator, Lacep. Body and tail elongated ; upper part of the 

 head convex ; snout rounded and very short ; dorsal fin near the 

 neck, and much elevated. Length 23 to 25 feet. North Seas. 



D. grampus, Desm. (D. orca, Lin.) The Grampus. Body and 

 tail elongated ; snout rounded and short j colour blackish above, 

 white below. Length 25 feet. British Seas. Shaw, ii. pi. 232. 



D. griseus, Cuv. Head like that of the porpoise ; dorsal fin elevated 

 and pointed, near the middle of the body; colour gray above, 

 fading into white below. Taken near Brest Mam. 518. 



D. globiceps, Cuv. Top of the head very convex ; snout rounded ; 

 dorsal fin not much elevated, sloping backwards, pectoral fins long 

 and pointed ; colour of the back shining black or gray. Eighteen 

 to twenty-one feet long. Mam. 519. 



Sub-Gen. 5. D PLPJHINOPTERUS, Lacep. Head obtuse ; snout short ; 

 no dorsal Jin. 



D. leucas, Desm. Beluga, Shaw. Head like that of the porpoise ; 



teeth short, blunt, nine on each side in both jaws ; fin of the back 



replaced by a slight angular eminence ; colour yellowish white. 



Twelve to eighteen feet long. Northern Seas Shaw, ii. pi. 232. 



An individual of this species was taken in the Firth of Forth in 1815. 



Sub-Gen. 6. HETERODON, Blainville. Teeth often one in each 

 jaw, or none ; lower jaw larger than the upper. 



D. hyperoodon, Desm. Head convex, terminated by a rounded and 

 flattened beak ; no teeth ; palate furnished with little points or 

 false teeth ; orifice of the spiracles crescent-shaped ; colour gray 

 above, whitish below. Twenty-three feet long Mam. 521. 



Gen. 150. MONODON, Lin. Narwhalus, Lacep. Cuv. 

 One or two large tusks in tbe upper jaw ; general form analo- 

 gous to the dolphins ; orifice of the spiracles united on the 

 top of the head ; a longitudinal dorsal crest. 



