578 DELPIIINIDiE. 



the upper jaw in adults, and 2 to 7 on oacli side of the lower jaw 

 near the symphysis. The common species, G. c/riseus, which has a 

 very wide range, is about 10 feet long, and grey in colour, the 

 hack and fins black and belly white ; the sides with numerous 

 irregular pale stx^eaks. 



Genus ORCELLA, Gray (18G6). 



Head globose, no beak. Dorsal fin small, falcate. Pectoral fins 

 of moderate size, broad at the base, subovate. 



Teeth 13 to 17 on each side of the upper jaw, 12-15 in the 

 low er ; small, conical, pointed, closely set, occupying nearly the 

 whole length of the rostrum, the posterior teeth disappearing with 

 age. Generally (perhaps in all adults) the anterior teeth in both 

 jaws are directed outwards, becoming at the anterior exti-emity of 

 each jaw almost horizontal, llostrum short, tapering, broad at the 

 base ; premaxillaries broad. Pterygoids widely separated from 

 each other, and very bluntly keeled. Mandibular symphysis short. 

 Vertebra): C. 7, D. 12-13, L. 14-15, C. 29-30 = 62-63. 



Two species have been described, one marine, the other 

 fluviatile, both Indian or Burmese. A full account of the anatomy 

 of both is given by Anderson in his ' Anatomical and Zoological 

 Eesearches.' 



Synopsis of Indian and Burmese Species. 



Colour blacldsli, without streaks O. hrcvirostris, p. 578. 



Colour pale slaty, with streaks O.Jiuminalis, p. 579. 



384. Orcella hrevirostris. The larger Indian Porpoise. 



Phocfena (Orca) brevirostris, Oiven, Tr. Z. S. vi, p. 24, j)l. ix, figs. 1, 

 2,3(1866). 



Orcella brevirostris, Anderson, P. Z. S. 1871, p. 143, fig-. 1; id. An. 

 Zool. Pes. p. 369, pi. xxv, fig-s. 4, 5, pi. xliii, figs. 6-10 ; True, 

 Dcljdnniddi, p. 182, pi. xxxviii, figs. 1,2; W. Sclater, Cat. p. 318. 



Loniba-l(j)nba, Malay. 



Fig. 189. — Orcella brevirostris. (From Anderson's figure.) 



Anterior profile of head very convex. Dorsal fin commencing 

 about middle of length, small, falcate, obtusely pointed. Pectoral 

 fins subtriangular, ])ointed. Teeth about |^}. 



