346 



PROTOZOOLOGY 



not spherical; extremely delicate pellicle shows 3 or 4 fine longitud- 

 inal lines which appear and disappear with the movement of the 

 body; 25-45ju by 20-35^; fresh water among vegetation. 



A. guttula Dujardin (Fig. 161, g). Ovoid during locomotion, nar- 

 rowed behind; often with a few minute, nipple-like dentations at 



Fig. 161. a, b, Amoeba proteus (a, X130 (Schaeffer), b, cyst (Doflein)); 

 c, A. discoides, X130 (Schaeffer); d, A. dubia, X130 (Schaeffer); e, A. 

 verrucosa, X200 (Cash); f, A. striata, X400 (Penard); g, A. guttula, 

 X800 (Penard); h, A. liviicola, X530 (Penard). 



the temporary posterior end; movement by wave-like expansions of 

 ectoplasm; endoplasm granulated, with crystals; nucleus vesicular; a 

 single contractile vacuole; 30-35/i by 20-25/i; fresh water in vege- 

 tation. 



