PROTOZOA. 



Fig. 34. — A Radiolarian {llialassicola pelagicax 20). 

 (After H/ECKEL.) 



Note the radiate pseudopodia, the vacuolated protoplasm and the central capsule. 



and the protoplasm consists of a main mass in and around it and 

 a fine anastomosing network of thin protoplasmic strands which serve 

 to entangle the food. The shells of these Foraminifera cover the 

 sea-floor in various regions, and similar shells form the main constitu- 

 ent of many chalk-strata. The pyramids of Egypt are built of 

 nummulitic limestone which is an aggregate of Foraminife7'an shells. 

 Hence, by virtue of their vast, numbers and the imperishable nature 

 of their shells, the Foraminifera are an important agency in the physical 

 changes of the earth's surface. 



Fig. 35. — A Living Foraminiferan 



{Miliola). 



Protoplasmic 

 Processes. 



Chambered Shell. 



