100 PROTOZOA. 
Fig. 34.-A RADIOLARIAN (Zhalassicola pelagica x 20). 
(After HascKet.) 
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 
nummniulitic limestone which is an aggregate of Foraminiferan shells. 
Hence, by virtue of their vast numbers and the imperishable nature 
of their shells, the “oram7nifera are an important agency in the physical 
changes of the earth’s surface. 
Fig. 35.—A Livinc FORAMINIFERAN 
(Miliola). 
Protoplasmic 
Processes. 
Chambered Shell. 
