PROTOZOA 



15 



the coast of Sicily. The nummuUtic hmestone of the Medi- 

 terranean basin is composed of the calcareous shells of 



Fig. 9. 

 1. A piece of Nummulitic limestone from 2. Vertical section of Nummulites. 

 the Pyrenees, showing Nwmmulites 3. Oriiioides. 

 laid open by fractures through the 

 median plane. 



Nummulites, a Foraminiferan, which sometimes acquired the 

 diameter of a shilling. Other species, such as Fumlina and 



PiQ, xO. Rotalia with pseudopodia extended through the pores of the shell. 



Botalia (Fig. 10), also took a large share in building up the 

 imestones of the Old World. 



