DOLPHINS 285 



in upper jaw, but 3-7 on each side of mandible near to 

 the symphysis. Vertebrae : C. 7 ; D. 12 ; L. 19 ; Ca. 

 30 = 68. Six or seven pairs of ribs two-headed; five 

 pairs, sometimes seven, reach the sternum. Skull 

 with pterygoids in contact ; pre-maxillae in front of 

 nares raised. No beak. Pectoral fin long, pointed, 

 falcate ; dorsal fin high and falcate. Number of 

 phalanges: I, 2. II, S-io. Ill, 6-8. IV, 3. V, i. 



In the vertebral column only the seventh vertebra 

 of the cervical series appears to remain free. 



The only species is Grampiis griseiis, Cuvier.* 

 D. rissoanus, Desmarest ; Grampus cuvieri, Gray ; 

 G. souverbianus, Fischer ; G. sakamata, Gray ; 

 G. stearnsi, Dall ; G. c/iinensis, Gray, are believed 

 really to refer to the same whale. 



This dolphin, often called Risso's dolphin, f is 

 mainly Mediterranean and North Atlantic in range. 

 But like so many other Cetaceans its limits are not 

 very fixed, and a skull (conceivably belonging to 

 a different species) has been recorded from the Cape. 

 It may return to those more southern latitudes during 

 the winter. Risso's dolphin is from 10-13 feet in 

 length, and is distinguished by its very remarkable 

 coloration. The prevalent tint is grey, varying on 

 the fins and tail to black, and to white on the belly. 

 This white has a yellowish tinge anteriorly, but the 

 curious feature of the coloration is a series of 



* Ann. Mus., xix., 1812, p. 14. 



t W. H. FLOWER, "On Risso's Dolphin," Trans. Zool. Sec., 1872, 

 vol. viii., p. i. 



