2 6 2 A BOOK OF WHALES 



skull is D. front alis and D. frccnatus, which has the 

 characteristic dark band from the angle of mouth to 

 pectoral limb. 



Prodelphinus longirostris, Gray/ x ' Length, nearly 

 7 feet. Vertebrae, 73 ; 14 dorsals. Teeth, 52. Palate 

 with traces of lateral groove (cf. Delphinus). Rostrum 

 very long. Japan, Malabar, Cape, Coast of Brazil, 

 Cape Horn, Galapagos, Australia. 



Genus LAGENORHYNCHUS. This genus may be 

 defined in the following terms : Head with short, not 

 very distinct, beak. Dorsal and pectoral fins falcate. 

 Teeth small, 22-45 m number on each jaw. Vertebrae, 

 73-92. Pterygoid bones in contact or separate. 

 Rostrum not exceeding, or scarcely exceeding, length 

 of cranium. 



This genus is another to which quite a large number 

 of species have been referred. But a number of them 

 are barely definable, and it is a difficult at present 

 perhaps impossible task to discriminate them with 

 accuracy. I give some description here of nearly all 

 the species that are allowed by True, a number be 

 it observed in excess of the probable species of Sir 

 William Flower's enumeration. In addition to the 

 features of the genus mentioned in its definition, 

 Lagenorhynchus is characterised by the length of the 

 neural and transverse processes of the lumbar vertebrae. 



* Spidlegia Zool., 1828, p. i. 



