THE CRAG. 



*79 



whole area of the London clay. The shelly beds 

 include a number of kinds of life which are now- 

 only represented in southern seas. A> many as 



two hundred species are said to be found living 

 in the Mediterranean, and a few are paralleled off 

 the COas ipan, Mexico and the West Indies. 



But while about sixty -five ^i the species are 



known only in southern seas, fourteen only in' 

 northern seas, and seventeen have been met with 

 in no other deposit, there are as many as 185 



'alline Crag shells still found in the British 



The rock is named Coralline Crag from the 



large extent to which its upper 1 " - -i-t of 

 the remains of Polyzoa which were- formerly 



termed COrallil I which are 



still living, 26 out ire met with in British 



It the majority of I ; g to the 



two extinct typ< //</, and Fasten- 



laria Hum with which me of 



the I 'nu a. '1'he 



fishes of th 



the common een 



cod, d, the : 



lack, whiting, and whit 



pout, with which have been 



found : at teeth of 



the shark ( 1 and 



of Otodt 



At the base of the < 

 alline Crag, in places where 

 the shark's teeth are found, FlG ^ 



IS a bed ot nodules Ot the Coralline Cra£. 



phosphate of lime, in which 



bones of the dolphin C/wncziphius occur with teeth 



of the whale BahenoJon, associated with teeth of 



