Triangle in front of the blowers flat. Teeth large, conical, acute, permanent. Pectoral fin falcate. Arm-bone short, broad. Metacarpal bones five, close together. Fingers very unequal, second and third much longer than the rest, six- or seven-jointed; first finger very short, two-jointed; third finger short, four-jointed, rather longer than the first two joints of the third finger. Tooth-line of the upper jaw nearly to the notch; of the lower jaw rather shorter. Lower jaw strong. Symphysis short, about as long as the space occupied by the first four teeth. Teeth large, conical, simple. Vertebræ 50:—C. 7. D. 10. L. 9. C. 24. The first to the sixth cervical vertebræ united by their bodies and dorsal processes. Bladebone broad, with large coracoid and acromion processes, which are much nearer together than usual. * _Beak blunt, truncated in front._ Pseudorca. 1. Pseudorca crassidens. Pseudorca crassidens, _Gray_, _Cat. S. & W._ p. 290. no. 1; _Synops. Whales & Dolph._ p. 8; _Gervais_, _Ostéogr. Cét._ t. 50. f. 7-17. Beak about two-thirds the length of the brain-cavity, broad, rather tapering on the sides, truncated in front; teeth 8. Inhab. North Sea. ** _Beak narrow, tapering, and rounded in front._ Neoorca. 2. Pseudorca meridionalis. B.M. Pseudorca meridionalis, _Gray_, _l. c._ p. 291. no. 2, figs. 58, 59; _Synops. Whales & Dolph._ p. 8; _Gervais_, _Ostéogr. Cét._ t. 50. Beak as long as the brain-cavity, tapering on the side, and rounded in front. Teeth 8. Inhab. Van Diemen’s Land. 13. ORCAELLA. Orcaella, _Gray_, _l. c._ p. 285; _Synops. Whales & Dolph._ p. 7. Head blunt, rounded, very convex. Body moderate. Dorsal fin moderate, more or less behind the middle of the back; the pectoral fin broad. Skull:—brain-case subglobular; beak very short, two-thirds the length of the brain-case, tapering, flat above. Intermaxillary half as wide as beak. Teeth small, conical, 12·12 / 12·12 or 14·14 / 14·14. 1. Orcaella brevirostris. B.M. Orcaella brevirostris, _Gray_, _l. c._ p. 285; _Synops. Whales & Dolph._ p. 7; _Anderson’s Icon. ined._ (animal and skull). Phocæna brevirostris, _Owen_, _Trans. Zool. Soc._ vi. t. 9. Globiocephalus indicus (part.), _Blyth_. Black; body stout; dorsal fin subcentral. Inhab. Estuaries of the Ganges (_Dr. Anderson_); Madras (_Elliot_). 2. Orcaella fluminalis. Orcaella fluminalis, _Anderson’s MS. & Icon. ined._ Dolphin of the Irawady, _Anderson_, _P. Z. S._ 1870, pp. 220, 544. “Body slender, dirty white; dorsal fin more posterior.” Inhab. River Irawady, deep channels, from 300 to 1000 miles from the sea (_Dr. Anderson_). Tribe V. PHOCÆNINA. Lateral wings of the maxilla shelving down over the orbit. Triangle in front of the blower convex. Teeth compressed. 14. PHOCÆNA.