250 



THE ATLANTIC. 



[chap. v. 



rayi is very widely distributed on the surface of warm seas, 

 more abundant, liowever, and of larger size in tlie Pacific than 

 in the Atlantic. The shell (Fig. 51) consists of a series of eight 



Fig. 51. — Ilastigerina J/wrraz/i, Wvville Thomson. From the surface. Fifty times the 



natural size. 



