390 



PROTOZOOLOGY 



1-2 terminal spines (12-44;u long); aperture circular, bordered by a 

 single row of 6-8 denticulate scales; 100-1 50yu long, diameter 30-60/^; 

 aperture 15-20yu in diameter. 



Genus Paulinella Lauterborn. Test small ovoid, not compressed; 

 with siliceous scales in alternating transverse rows; aperture ter- 

 minal; bodj^ does not fill the test completely ; nucleus posterior; among 

 vegetation in fresh or brackish water. 



Fig. 182. a, Eughjpha cristata, X330 (Wailes); b, E. mucronata, X330 

 (Wailes); c, Paulinella chromatophora, XlOOO (Wailes); d, Cyphoderia 

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



P. chromatophora L. (Fig. 182, c). Scales arranged in 11-12 rows; 

 with 1-2 curved algal symbionts; no food particles; a single con- 

 tractile vacuole; 20-32^ long; 14-23^ in diameter. 



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; pseudo podia, few, long 

 filose, simple or branched; fresh water. 



C. ampulla (Ehrenberg) (Fig. 182, d). Test usually yellow, trans- 

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

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



