SECTION Y. 



THE RHIZCPODA OR RHIZOPODS. 



THE Rhizopods or " Root-footed" protozoa are so called 

 from the root-like filaments which the}' extend from the 

 main mass of the body (from the Gr. r/iisa, a root, and 

 '2>ous, a foot). These root-like projections are also called 

 pseudopodia or false feet. Many rhizopods increase by 

 self-division. 



Tliose called Radiolaria have a highly developed silic- 

 eous or glass-like shell. They multiply by the produc- 

 tion of bodies called zoospores. 



The Radiolarian shells are minute, and, as the name 

 implies, are radiate in their structure. They 

 are remarkable in the variety of their forms ; 

 and they are curiously and beautifully orna- 

 mented. The most remarkable forms are 

 called Polycistines. They abound in the 

 sea, and in many places Island of Barbadoes, 

 etc., they make up a large part of extensive 



TOck f nriatiollS - 



The Foraminifera are rhizopods which, in 



FlG 745 



PolycisUne- 



FlG. 747. 



FIG. 748. 



FIG. 746. 



Naked Rhizopod, Amccla ra- 



Foramiuifer, Polystomella 

 crispa. 



Foraminifer, 

 Nummulites 

 lenticularis, 



A Section, 



