10. pnociENA. 305 



A very young specimen. Length from end of nose to nick in the 

 tail 162 centimetres ; circumference in middle, the largest part, 102 

 centimetres. Uniform black colour. 



The central series of spines commences in the middle of the back ; 

 nearer the front edge of the dorsal iin it has a series on each side of 

 it ; and on the rounded edge of the fin there is another series on 

 the outer side of the preceding, making five in all. The spines are 

 only elevations of the skin, of an elongated oval form, and each is 

 surrounded by a ridge. Vent surrounded by radiating ridges. Pec- 

 toral fin falcate. 



Consult 



Phocfena pectoralis, Peale, Zool. Expl. Exped. Mamm. 32, ed. 1, 1848 



(transcribed) — 

 Delphiniis pectoralis, Cassin, U. S. Expl. Exped, Mamm. 28 (1858), 



t. 5. f. 2— 



" Colour blue-black, a white spot on each side of the breast in 

 front of the pectoral fins ; a frontal band of light slate-colour extends 

 a short distance behind the eyes ; vent and abdomen light reddish 

 white ; lips margined with reddish white. 



" Total length 8 feet 8 inches ; greatest diameter 21 inches ; dorsal 

 fin, measured along the front edge, 14 inches ; pectoral fin 16 inches ; 

 tail 25| inches in diameter ; from the end of the snout to the comer 

 of the mouth 11| inches; eye from the end of the snout 13 inches. 



"Dental formula: ^||;|f =92? 



" Sixty of these animals were driven on shore by the natives at 

 Hilo Bay, Island of Hawaii, at one time. They were considered 

 dainty food, and yielded a valuable stock of oil. Only one lower jaw 

 was saved as a specimen. It is more rounded than usual at the 

 extremity ; the teeth are stout, project outwards, and are worn nearly 

 even with the gums, showing that our specimen was an old animal, 

 and probably of the maximum size." 



" This species appears to be related to both D. ohscurus and D.Hea- 

 visidii, Gray, and belongs to the same subgeneric group, if not spe- 

 cifically identical with one or the other. It more strongly resembles 

 the latter ; but we have failed to recognize it as a described species 

 from the lower jaw above aUuded to." 



What are IPhoccena latirostris (J. Brookes's Cat. 39), IPlioccena 

 Grcujii (J. Brookes's Cat. 39), and Plioccena, n. s. (Macgillivray, Voy. 

 Rattlesnake, i. 48), " not allowed to be killed by the natives of 

 Moreton Bay, Australia" ? 



Dr. J. R. Foster mentions PJiocrena as being found in the Pacific 

 Ocean (Descr. Anim. 156, 210) ; Cape of Good Hope (I. c. 316). 



