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Show 506 PROF. FLOWER ON THE DELPHINIDJE. [Nov. 20, (P. vomerina, Gill) from the North Pacific. Photographs of the skull of one of these animals from Puget Sound, sent to the International Fisheries Exhibition of 1883, when compared with a large series of skulls from the British seas, show absolute identity. There may, however, be characters other than cranial by which they may be distinguished. In the same collection was a photograph of a lower jaw of Delphinus pectoralis, Peale, from Hawaii, which has teeth of the same peculiar character as P. communis, but which appears to belong to an animal of much larger size, the ramus being 13^ inches long, as against 81, the length of that of a full-grown common Porpoise. The figure given by Peale (in Wilkes's voyage) of the external form shows an animal with a head like that of the Porpoise, but with a rather high and falcate dorsal fin. The entire length is stated to be 8 feet 8 inches, which would be in correspondence with that of tbe jaw photographed. Phocana spinipennis, Burmeister (P. Z. S. 1865, p. 228, and Ann. Mus. Buenos Ayres, i. p. 380, 1869), from the mouth of the Plata, may be distinct. It forms the genus Acanthodelphis of Gray. NEOMERIS, Gray, Zool. Erebus and Terror, p. 30 (1846). Closely allied to Phocana, so much so that if the genus had not been generally accepted, it would have been better not to have separated . . . 1ft it. The principal difference is the absence of dorsal fin. Teeth ^ to 20 2Q, larger proportionally than is Phocana, and more distinctly notched or lobed on the free edge of the crown. Vertebrae : C. 7, D. 13 L. 13, C. 30, total 63 (Leiden Museum). One species, N. phocanoides, Cuvier (R. A. 2nd edit. i. p. 291, 1829), = Delphinus melas, Schlegel, Fauna Japonica, from the Indian Ocean and Japan. 6. Crowns of the teeth more or less conical and pointed. C E P H A L O R H Y N C H U S , Gray, Cat. Cetacea Brit. Mus. p. 106 (1850)1. Rostrum as long and sometimes slightly longer than the cranial part of the skull. Pterygoids widely separated from one another (see fig. 4, p. 473). Teeth small (less than 3 m m . in diameter), "f. to |°. Vertebrae : C. 7, D. 13, L. 15, 0. 30 ; total 65. Dorsal fin low, obtusely triangular or rounded. Pectoral fins rather small, narrow, ovate. To this genus appear to belong the species, real or nominal, described under the following names :- Delphinus heavisidii, Gray, Spicilegia Zoologica, p. 2 (1828). D. capensis, F. Cuvier, Hist. Nat. des Mammiferes (1829). D.cephalorhynchus,^.Cuvier,Hist. Nat. des Cetaces, p. 158(1836). D. hastatus (Quoy), F. Cuvier, ibid. p. 161. Electra clancula, Hector, Trans. N e w Zealand Inst. v. p. 160(1873). Electra hectori, Van Beneden, Bull. Acad. Roy. de Belgique, 3rd ser. t. i. no. 6 (1881). 1 This generic name is generally attributed to F. Cuvier (Hist. Nat. des Cetaces, L836, p. 158), but it was only proposed by him as a specific designation. |