460 GEOGRAPHICAL ZOOLOGY. [PART iv. 



SUB-CLASS IV. CHONDEOPTERYGII. (SHARKS 

 AND KAYS.) 



Order IHOLQCEPHALA. (Chimceras.) 



FAMILY 98. CHIMJERnLE. (2 Genera, 4 Species.) 



" Shark-like marine fishes, snout of the male with a prehensile 

 organ." 



DISTRIBUTION. Northern and Southern temperate seas. Chi- 

 mcera is British. 



Order ILPLAGIOSTOMATA. 

 Sub-order. SELACHOIDEA. (Sharks.) 



FAMILY 99. CARCHARIID^E. (11 Genera, 59 Species.) 

 " Sharks with two dorsals and a nictitating membrane." 



DISTRIBUTION. Seas of the Arctic, temperate, and tropical 

 regions. Species of Galeus and Mustelus have occurred on our 

 coasts. 



FAMILY 100. LAMNID^E. (5 Genera, 7 Species.) 

 " Sharks with two dorsals and no nictitating membrane." 



DISTRIBUTION. Temperate and tropical seas. Species of 

 Lamna, Alopecias, and Selache have occurred in British seas. 



