340 



PROTOZOOLOGY 



P. chromatophora L. (Fig. 155, c). Scales arranged in 11-12 

 rows, 5 scales in each row; with 1-2 curved chromatophores; no 

 food particles; a single contractile vacuole; 20-32// long; 14-23^1 

 in diameter. 



/ 



Xl% 



Fig. 155. a, Euglypha cristata, X330 (Wailes); b, E. mucronata, 

 X330 (Wailes); c, Paidinella chromatophora, XlOOO (Wailes); d, Cy- 

 phoderia ampulla, X200 (Cash); e, f, Corythion pulchellum, X350 

 (Wailes). 



Genus Cyphoderia Schlumberger. Test retort-shaped; colorless 

 to yellow; made up of a thin chitinous membrane, covered with 

 discs or scales; aperture terminal, oblique, circular; body does not 

 fill the test completely; nucleus large, posterior, pseudopodia, 

 few, long filose, simple or branched; fresh water. 



C. ampulla (Ehrenherg) (Fig. 155, rf). Test usually yellow, trans- 

 lucent, composed of. discs, arranged in diagonal rows; circular in 

 cross-section; aperture circular; cytoplasm gray, with many gran- 

 ules and food particles; 2 contractile vacuoles; 60-200/i long; 

 diameter 30-70/x. Several varieties. 



Genus Trinema Dujardin. Test small, hyaline, ovoid, com- 

 pressed anteriorly, with circular siliceous scales; aperture circular, 



