390 THE OCEAN WORLD. 



short-footed animals are past. Of the 1842 * species formerly known, a 

 few types of a small number of genera only are left, numbering in all 

 102. The Terebratulicbe are best represented; there were once 300 

 or 400 species; there are now not more than 67 in the seas of 

 the world. The difference between the past and the present is 

 especially striking, when we compare the recent and fossil species of 

 Europe. Among no other class of shells has there been such a 

 wholesale extinction of species. The great family of Spiriferae are 

 wholly extinct, and of 400 Ehynconella only four are now living. 

 The curious Crania, Discina, and Lingula are still living, and are 

 mostly found in the seas of the southern hemisphere. 



* Woodward's Manual, p. 135. 



