Teeth 28 or 29. Pectoral fin very broad: fingers five; the index the longest, the thumb and little finger the least developed. The caudal vertebræ very strong. The first two of the cervical vertebræ united, the five others separate. Sternum in three pieces. Tribe II. DELPHININA. Delphinina, _Gray_, _Synops. Whales & Dolph._ p. 5. Head beaked. Teeth conical. Beak of the skull elongate, longer than the brain-cavity, depressed, broad, shelving on the sides. Nasal triangle short. Symphysis of the lower jaw very short, sloping. Dorsal fin subcentral, rarely wanting. a. _Beak elongate. Palate with a deep groove on each side behind._ 3. DELPHINUS. Delphinus, _Gray_, _l. c._ pp. 230, 239, 393; _Synops. Whales & Dolph._ p. 5. Beak elongate. Dorsal fin distinct. Teeth small, slender, five or six in an inch. Fingers elongate, unequal; the second much the longest, 8- or 9-jointed; third elongate, about three-fourths the length; the rest short. Fœtus and tongue figured, t. 26. f. 2 of Synops. Whales and Dolph. * _Beak of skull twice as long as the brain-case. Teeth 55/55 or 56/56._ 1. Delphinus longirostris. B.M. Delphinus longirostris, _Gray_, _l. c._ p. 241. no. 2; _Synops. Whales & Dolph._ p. 5. Inhab. Southern Ocean; Cape of Good Hope; Japan; Malabar. ** _Beak of skull once and a half the length of the brain-case. Teeth 45/45 to 50/50._ 2. Delphinus delphis. B.M. Delphinus delphis, _Gray_, _l. c._ pp. 242 (n. 3), 396; _Synops. Whales & Dolph._ p. 5; _Reinhardt_, _Vidensk. Meddel._ 1866, t. 1. Black, sides grey, beneath white. Inhab. North Sea; North Atlantic; Mediterranean. Vertebræ 75:—C. 7. D. 13. L. 24. C. 31. 3. Delphinus Moorei. Delphinus Moorei, _Gray_, _l. c._ p. 396, fig. 99; _Synops. Whales & Dolph._ p. 5. Inhab. South Atlantic. 4. Delphinus major. B.M. Delphinus major, _Gray_, _l. c._ p. 396; _Synops. Whales & Dolph._ p. 5. Inhab. ⸺? 5. Delphinus Walkeri. Delphinus Walkeri, _Gray_, _l. c._ p. 397, fig. 100; _Synops. Whales & Dolph._ p. 5. Inhab. South Atlantic. Burmeister (‘Anales Mus. Buenos Ayres,’ i. p. 306) erroneously considers it a synonym of _D. microps_, which is a _Clymenia_. 6. Delphinus Janira. B.M. Delphinus Janira, _Gray_, _l. c._ pp. 245, 398; _Zool. Ereb. & Terror_, t. 23; _Synops. Whales & Dolph._ p. 5, t. 23. Inhab. Newfoundland. 7. Delphinus fulvifasciatus. B.M. Delphinus fulvifasciatus, _Pucheran_, _Voy. Dumont d’Urville, Mamm._ t. 21. f. 1, t. 23. f. 1, 2 (skull); _Gray_, _Cat. Seals & Whales_, p. 252. Inhab. Van Diemen’s Land.