SELACHOIDEI. 333 



conical ; the lower teeth numerous, in several series, the point 



Fig. 123. — Dentition of the Greenland Shark. Some teeth are represented 

 of the natural size ; those of the lower jaw in three series. 



SO much turned aside that the inner maigin forms a cutting, non- 

 serrated edge. Jaws feeble. Spiracles of moderate width. 



The "Greenland Shark" is an inhabitant of the Arctic 

 regions, but rarely straying to the latitudes of great Britain ; 

 it grows to a length of about 15 feet, and, although it never 

 or but rarely attacks man, is one of the greatest enemies of 

 the whale, which is often found with large pieces bitten out 



Pig. 124. — Lffimargus borealis, Greenland Shark. 



of the tail by this Shark. Its voracity is so great that, 

 according to Scoresby, it is absolutely fearless of the presence 

 of man whilst engaged in feeding on the carcase of a whale, 

 so that it can be pierced through with a spear or knife with- 

 out being driven away. It is stated to be viviparous, and to 

 produce about four young at a birth. 



EcHiNOHHiNUs. — Two vsry small dorsal fins, without spine, 



