RISSOS GRAMPUS. 29 1 



total absence of teeth in the upper jaw, the dentition of the 

 lower jaw being reduced to from three to seven pairs of teeth 

 which are confined to its anterior extremity. In general con- 

 formation of the head and body the single well-defined repre- 

 sentative of the genus comes very close to the Pilot-Whale, 

 although the fore part of the head is less rounded, and the 

 flippers are shorter. 



RISSO'S GRAMPUS. GRAMPUS GRISEUS. 



Dclphinus griseus, Cuvier, Ann. Mus. vol. xix. p. 14 



(1812). 

 Delphinus rissoanus, Desmarest, Mammalogie, p. 15 (1822). 

 Grampus griseus, Gray, Spicil. Zool. p. 2 (1828); Bell, 



British Quadrupeds, 2nd ed. p. 450 (1874); Southwell, 



British Seals and Whales, p. 115 (1881) ; Flower, List 



Cetacea Brit. Mus. p. 21 (1885). 

 Grampus aivieri, Gray, Ann. Mag. Nat. Hist. vol. xvii. p. 85 



(1846) ; id. Cat. Seals and Whales, Brit. Mus. p. 295 



(1866). 

 Grampus rissoanus, Gray Zool. Voy. Erebus and Terror, p. 



31 (1846) ; id. Cat. Seals and Whales, Brit. Mus. p. 298 



(1866). 

 Characters. — Colour very variable, from black above and 

 white beneath, to a pale grey, passing into black towards the 

 tail, everywhere marked with light spots and irregular streaks 

 and stripes. Length of adult about 13 feet. 



Distribution. — Although rare in collections, Risso's Grampus 

 appears to be a widely distributed species, since it has been 

 taken not only in the British seas and the Mediterranean, 

 but likewise in the Azores, the Cape of Good Hope, Japan, 

 the North American coasts, and New Zealand (the specimen 

 from the last-named country having been described as S, 

 richardsoni). 



