THE PROTOZOA. 



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. 



Figs, ljto 8. Amoeba : x 400. (c. h. h.) 



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

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

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

 intervals of about twenty seconds. 



N, nucleus, p, pseudopodium. pv, pulsating vacuole. 



Within the endosarc make out the following structures. 



a. Vacuoles are spaces filled with fluid, which is less 



dense than the surrounding protoplasm. They 

 contain in many cases algae taken in as food. 



b. The pulsating vacuole is a space filled with a watery 



fluid. It is fairly constant in position, and 

 pulsates rhythmically. More than one may be 

 present. Time its pulsations. 



c. The nucleus is a spherical granular body, denser 



