TESTACEA 479 



Genus Pseudochlamys Claparede and Lachmann. Test discoid, 

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

 tractile vacuoles. 



P. patella C. and L. (Fig. 202, c). Young test hyaline, older one 

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

 pseudopodium between folds; 40-45ai 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. 202, d, e). About 40^ by 28/z; among vege- 

 tation. 



Genus Cryptodifflugia Penard. Small test j^ellowish to brownish; 

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

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



C. ovijormis P. (Fig. 202, /). Test ovoid; without foreign bodies; 

 crown hemispherical; aperture truncate; cytoplasm with chloro- 

 phyllous food particles; 16-20/x by 12-15/x; 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. 202, g). Aperture circular; border 

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

 by 68-1 14/i ; 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. 202, 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; 110-140/* 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 

 movement and contraction of body; with or without spinous pro- 

 jections. 



