182 BULLETIN 36, UfHTED STATES NATIONAL MUSEUM. 



ORCELLA BREVIROSTRIS Owcu. 

 (Plate 38, figs, land 2.) 



Head convex from the blowhole to the upper lip. Pectoral tins tri 

 angular — one-half as broad as long. Dorsal fin rising in the center dt 

 the back, comparatively small, falcate, obtusely pointed. "The line 

 of the back is sharp from this fin down to the tail. The ventral line is 

 the same for some inches behind the anus." 



"Color dark slaty-blue above, almost black; a little paler below, 

 without any streaks or marks" (Anderson and Sterndale). 



Length from snout to caudal notch about 7 feet. 



Habitat. — Bay of Bengal ; Yizagapatam ; Singapore. 



ORCELLA FLUMINALIS Andersou. 



Like O. brevirostris, but with rather smaller, lower, and more falcate 

 dorsal fin. Head less anteriorly bulging. Pectoral fins shorter and 

 broader. 



Color pale bluish above, white underneath, with numerous streaks, 

 as in Grampus griseus (Anderson and Sterndale). 



Length, 7 to 7 J feet. 



Habitat. — Irawaddy Eiver, Burmah, 300 to 900 miles from the sea. 



14. GRAMPUS Gray, 



Eo^truni moderate, expanded in front of the maxillary notches, and 

 tapering thence to an obtuse termination. Triangular area in front of 

 the superior nares raised above the level of the surrounding bones, and 

 convex. Kostral i^ortion of the intermaxilhi^ broad and moderately 

 rounded. Symphysis of mandible short. Pterygoid bones in contact- 

 Teeth 2 to 7, in the mandible only, and confined to the region of the 

 symphysis. Vertebrae, G8. 



Head globose, with slightly protuberant lips; beak wanting; mouth 

 oblique. Dorsal fin prominent and falcate. Pectoral fins rather nar- 

 row, elongated, and falcate. Color slate-gray, mottled, and very irreg- 

 ularly streaked. 



GRAMPUS GRISEUS (Cuvior). 

 (Plate 39, figs. 1 aud-2.) 



General form somewhat similar to that of Globicephalus. Head 

 globose, with a slight indication of a beak; mouth oblique; lower jaw- 

 shorter than the upper. Dorsal fin high and falcate; pectoral fins fal- 

 cate, elongated. Flukes narrow an tero posteriorly. 



Back, dorsal fin and flakes dark gray or blackish, more or less tinged 

 with purple. Pectoral fins blackish and mottled with gray. Head 

 and anterior half of body light gray, varied in hue and tinged with 



