574 DELPlIl>fID.i;. 



indebted to Blyth *, Elliot, and Anderson. In all probability 

 several species have still to be recognized, whilst o£ some o£ those 

 known only single occnrrences have hitherto been recorded. Skins 

 are difficult to preserve, and of no great use in identification ; a 

 good sketch to scale and a skeleton are better. 



Synopsis of Indian Genera. 



A. Teeth small, spade-like, with flat crowns .... Phocjena. 



B. Teeth very large, au inch in diameter or more. OnCA. 



C. Teeth moderate or small, conical. 



a. Head globose, no trace of a beak. 



a. Teeth confined to anterior half of rostrum. Globicephalus. 



b'. Teeth occupying greater part of rostrum. . Oijcella. 



b. Head with a short, not very distinct beak . . Lagenorhynchus. 



c. Head with a distinct compressed beak. 



a'. Teeth not less than ^ inch in diameter, 

 and round in section. 

 a". Symphysis much shorter than \ man- 

 dible TURSIOPS. 



b". Symphysis longer than \ mandible. . . . Steno. 

 b' . Teeth less than ] inch in diameter, oval in 

 section, and exceeding 35 on each side of 

 each jaw Delpiiinus. 



Genus PHOC^NA, Cuvier (1817). 

 Syn. Neonieris, Gray (1S4G) (nee Lamouroux). 



Size small. Head without a beak, snout rounded. Dorsal fin 

 variable, wanting in the only Indian species. 



Teeth IG to 26 on each side of each jaw, small, spade-shaped, the 

 crown being much broader than the root, and compressed in the 

 direction of the jaw, the upper border either entire or divided into 

 two or three lobes. Rostrum short and broad, palate very broad. 

 Pterygoid bones small, widely separated. Mandibular symphysis 

 short. Vertebra? 57 to 67. 



This genus, the type of which is the common porpoise of the 

 British Islands, is widely distributed on sea-coasts and in estuaries. 

 One species is found in India. 



381. Phocsena phocsenoides. The little Indian Porpoise. 



Delphinapterus phocnenoides, Citv. Hh/ne An. 4d. 2, i, p. 291 (1829). 

 Neonieris phocfenoides, Gray, Zoul. Ereb. 8f Terror, p. 30 (184G) ; 



Bh/th, J. A. S. B. xxix, p. 449 ; id. Cat. p. 89 ; Fkmer, P. Z. S. 



]883, ]). 50G; 'True, Delphiiiidce, pp. 114, 178, pi. xxxiv, tigs. 1,2; 



W. Sclater, Cat. p. 318. 



* I am indebted to Mr. W. L. Sclater, who has kindly made notes and 

 measurements of tlic si)ecimens preserved iu the CalcuUu, Museum, lor uuieh 

 assistance in idoutifyiug the species mentioned by 151yth. 



