'HIE PROTOZOA. 



retraction, of which cause great changes in the form of the 

 cell. The pseudopodia may branch slightly. 



B. Structure. 



The whole hody is a naked mass of protoplasm, of which 

 two portions are distinguishable. 



1. The cctosarc is the clearer outer portion of the body. 



p -A , 



Figs. 1 to 8. — Amoeba ; x 400. (c. h. h.) 



Pigs. 2 and 3 were drawn from the same specimen, wliich was moving 

 in the direction shown by the arrow. Fig. 4 is a form with branch- 

 ing pseudopodia. Figs. 5 to 8 were drawn from one specimen at 

 intervals of about twenty seconds. 

 N", nucleus. P, pseudopodium. PV, pulsating vacuole. 



2. The endosarc is the granular central portion. Its 

 flowing movements, which accompany the pro- 

 trusion and retraction of the pseudopodia, are 

 rendered obvious by the granules contained in it. 



Witliin the endosarc make out the following structures. 



