DELPHINID^. — CXCI. 333 



nasal tube. Genera 1 7 ; species numerous, including the smaller 

 and many of the most active and voracious of the Cetacea. 



a. Head with an elongate beak; a distinct dorsal fin. 

 ' b. Teeth in each jaw about 44; truncate at tip; palate without lateral 



grooves Tuksiops, 571. 



bb. Teeth in each jaw 80 to 120. 



X. Palate without lateral grooves Pkodelphinus, 572. 



XX. Palate with deep lateral grooves DELPHiJifs, 573. 



aa. Head with a very short beak or none. 

 c. Teeth in both jaws persistent. 



d. Teeth flattened; dorsal present PnoCiENA, 574. 



dd. Teeth terete. 



e. Dorsal fin well developed. 

 f. Teeth in each jaw 44 to 40; dorsal fin falcate. 



Lagenorhynchus, 575. 

 jy. Teeth in each jaw 16 to 24. 



a. Dorsal moderate; head almost globular; P. long and narrow; 

 teeth rather weak, none in corner of mouth. 



Globicephala, 576. 

 ffg. Dorsal very high, sword-shaped, its height greater than lengtii 

 of pectorals; teeth very strong; skull massive. Orca, 577. 

 ee. Dorsal fin obsolete ; pectoral short; teeth few. 



Dklphinaptkrus, 57S. 



cc. Teeth in upper jaw feeble, disappearing with age; 6 to 14 liluntish 



teeth in lower jaw; dorsal fin low, rather posterior. Gkampus, 579. 



571. TURSIOPS Gervais. (Tursio, porpoise; a>-^, 

 appearance.) 



1097. T. tursio (Fabricius). Bottle-nose Dolphin. Gray- 

 above, pure white below ; beak short and stout ; teeth H. Ver- 

 tebra; 7-]-18-|-37. Ti. 11 feet. N. Atl., common ; caught in num- 

 bers at Cape May. (-Eu.) 



572. PRODELPHINUS Gervais. (n-po, before ; Delphinus.) 



1098. P. plagiodon (Cope). Spotted Dolphin. Form of 

 D. delphis; dorsal high, recurved; arm broad; beak stout. Dark 

 purpUsh slate-color, above ; white below ; back and fins spotted 

 with pale; lower parts spotted with dark slate. L. 10 feet. N. 

 Atl., S. to N. J. (n-Xaytoy, oblique ; 65a)v, tooth.) 



573. DELPHINUS Linnaeus. (8e\(f)is, dolphin.) 



1099. D. delphis L. Common Dolphin. Snout narrow, 

 sharp ; occiput short, rounded. L. 10 feet. N. Atl., scarce on our 

 coast. (Eu.) 



574. PHOCiENA Cuvier. ((pcoKaLva, porpoise, from {^wk?;, seal.) 



1100. P. phocaena (L.). Common Harbor Porpoise. Puf- 

 fing Pig. Snuffer. Color nearly plain dusky above, paler 

 below. L. 5 feet. N. Atl. and N. Pac, very common in surf 



