TESTACEA 381 



brown; a single vesicular nucleus; pseudopodia short, lobose or 

 digitate; 20^* in diameter; on vegetation. 



Genus Pseudochlamys Clapar^de and Lachmann. Test discoid, 

 flexible when young; body with a central nucleus and several con- 

 tractile vacuoles. 



P. patella C. and L. (Fig. 178, c). Young test hyaline, older one 

 rigid and brown; often rolled up like a scroll; a short finger-like 

 pseudopodium between folds; 40-45/1 in diameter; in fresh water 

 among vegetation, in moss and soil. 



Genus Difflugiella Cash. Test ovoid, not compressed, flexible 

 and transparent membrane; colorless cytoplasm fills the test, usually 

 with chlorophyllous food material; median pseudopodia lobate or 

 digitate with aciculate ends, while lateral pseudopods long, straight, 

 and fine, tapering to a point; fresh water. One species. 



D. apiculata C. (Fig. 178, d, e). About 40/i by 28m ; among vege- 

 tation. 



Genus Cryptodifflugia Penard, Small test yellowish to brownish; 

 Difflugia-like in general appearance, compressed; with or without 

 foreign bodies; pseudopodia long, acutely pointed; fresh water. 



C. oviformis P. (Fig. 178,/). Test ovoid; without foreign bodies; 

 crown hemispherical; aperture truncate; cytoplasm with chloro- 

 phyllous food particles; 16-20iu by 12-15/1 ; in marshy soil. 



Genus Lesquereusia Schlumberger. Test compressed, oval or 

 globular in profile, narrowed at bent back; semispiral in appearance; 

 with curved or comma-shaped rods or with sand-grains (in one 

 species); body does not fill up the test; pseudopodia simple or 

 branched ; fresh water. 



L. spiralis (Ehrenberg) (Fig. 178, g). Aperture circular; border 

 distinct; cytoplasm appears pale yellow; a single nucleus; 96-188/i 

 by 68-1 14/1 ; in marsh water. 



Genus Hyalosphenia Stein. Test ovoid or pyriform; aperture end 

 convex; homogeneous and hyaline, mostly compressed; crown uni- 

 formly arched; protoplasm partly filling the test; several blunt 

 pseudopodia simple or digitate. Several species. 



H. papilio Leidy (Fig. 178, h). Test yellowish; transparent; 

 pyriform or oblong in front view; a minute pore on each side of crown 

 and sometimes one also in center; aperture convex; in narrow lateral 

 view, elongate pyriform, aperture a shallow notch; with chloro- 

 phyllous particles and oil globules; llO-140/i long; in fresh water 

 among vegetation. 



Genus Corycia Dujardin. Envelope extremely pliable, open at 

 base, but when closed, sack-like; envelope changes its shape with 



