246 SNAKES. 



may be species hitherto unobserved. The great sea serpent 

 question is not yet satisfactorily settled ; and among the 

 lesser kind, the true pelagians, varieties are frequently 

 occurring. Krefift describes one in the Australian Museum 

 which, not being like any other that he had seen, he sets 

 down as a new type. Forty-eight distinct species were 

 described by Cantor. The whole family comprises seven 

 genera, four of which belong to the Indian Ocean. 



