42 THE BRITISH MAMMALS I THEIR GENERA AND SPECIES. 



patches on the flanks, behind the blow-hole, and at the root of the 

 tail. In each jaw are twenty-six pairs of teeth ; the vertebrae are 



SUPRA.OCC1PITAL 



SQUAM05A.U 



WHITE-BEAKED DOLPHIN. 

 (Lagenorhynchus albirostris.) 



ninety-two in number. The largest specimen yet measured was 

 nine feet in length. The figure is lettered to show the remarkable 

 modification of the skull components in this and other genera of the 

 dolphin family. 



The White-sided Dolphin is another Arctic species, hunting in 

 companies in pursuit of herrings and other fishes in the Northern 



WHITE-SIDED DOLPHIN. 



(Lagennrhynchus acutus.) 



seas, but rarely appearing in British waters. The head is flatter 

 than io the foregoing species; the Dorsal fin js higher, and the 



