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 Inter- 

 national 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 Delp/iinus pectoralis, Peale, from Hawaii, which has 

 teeth of the same peculiar character as P. commvnis, l)ut which 

 appears to belong to an animal of mucii larger size, the ramus being 

 13| inches long, as against 8^, 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 Por- 

 poise, but with a rather high and falcate dorsal fin. The entire 

 length is stated to be 8 feet 8 inches, which would be in corre- 

 spondence with that of the jaw photographed. 



Phoccena spinipennis, Burmeister (P. Z. S. 186.5, p. 228, and 

 Ann. Mus. Buenos Ayres, i. \). 380, 1869), from the mouth of the 

 Plata, may be distinct. It forms the genus AcantJtodelphis of Gray. 



Neomeris, Gray, Zool. Erebus and Terror, p. 30 (1846). 

 Closely allied to Phoccena, so much so that if the genus had not 

 been generally accepted, it would have been better not to have separated 



it. The principal difference is the absence of dorsal flu. Teeth j^ to 



20 



2Q. larger proportionally than is Phoccena, and more distinctly notched 

 or lobed on th^ free edge of the crown. Vertebrae : C. 7, D. 13 

 L. 13, C. 30, total 63 (Leiden Museum). 



One species, iV^. phoccenoides, Cuvier (R. A. 2nd edit. i. p. 291, 

 \S29),-=^BeIphinus melas, Schlegel, Fauna Japonica, from the Indian 

 Ocean and Japan. 



ft. Crowns of the teeth more or less conical and pointed. 



Cephalorhynchus, Gray, Cat. Cetacea Brit. Mus. p. 106 (1850)\ 



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 mm. in diameter), ~~ to ~q. Ver- 

 tebrae : C. 7, D. 13, L. 15, C. 30 ; total 65. Dorsal &n low, obtusely 

 triangular or rounded. Pectoral fins rather small, narrow, ovate. 



To this genus appear to belong the species, real or nominal, de- 

 scribed under the following names : — 



Delphinus heavisidii, Gray, Spicilegia Zoologica, p. 2 (1828). 

 D. capensis, F. Cuvier, Hist. Nat. des Mnmmiferes (1829). 

 D. cephalorhyncJws, F.Cavler, Hist. 'Nat. desCetaccs, p. 158(1836). 

 D. hastatiis (Quoy), F. Cuvier, ibid. p. 161. 

 i7ec^rac/a?ic?//ff. Hector, Trans. New Zealand Inst. v. p. 160(1873). 

 Electra hectori, Van Beneden, Bull. Acad. Roy. de Belgique, 

 3rd ser. t. i. no. 6 (1881). 



' TMs generic name is generally attributed to P. Cuvier (Hist. Nat. des 

 Cetaces, L836, p. 158), but it was only proposed by him as a specific designation. 



