TESTACEA 331 



distinct; cytoplasm appears pale yellow; a single nucleus; 96- 

 188/i by 68-1 14/x; in marsh water. 



Genus Hyalosphenia Stein. Test ovoid or pyriform; aperture 

 end convex; homogeneous and hyaline, mostly compressed; 

 crown uniformly arched; protoplasm partly filling the test; sev- 

 eral blunt pseudopodia simple or digitate. Several species. 



H. papilio Leidy (Fig. 151, 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 nar- 

 row lateral view, elongate pyriform, aperture a shallow notch; 

 with chlorophyllous particles and oil globules; 110-140/1 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 w^ithout spinous pro- 

 jections. 



C. coronata Penard (Fig. 151, i). 6-12 spines; 140/1 in diameter; 

 in moss. 



Genus Pamphagus Bailey. Test hyaline membranous, flexible; 

 aperture small; body fills the envelope completely; spherical nu- 

 cleus large; contractile vacuoles; filopodia long, delicate, branch- 

 ing, but not anastomosing; fresh water. 



P. mutaUlis B. (Fig. 151, j). Envelope 40-100^ by 28-68^. 



Genus Plagiophrys Claparede et Lachmann. Envelope thin, 

 hyaline, changeable with body form; usually elongate-oval with 

 rounded posterior end; narrowed at other half; envelope shows 

 fine punctuation with a few small plates; aperture round; cyto- 

 plasm clear; nucleus large; pseudopods straight filopodia, some- 

 times branching; fresh water. 



P. parvipunctata Penard (Fig. 151, k). Envelope 50/1 long. 



Genus Leptochlamys West. Test ovoid, thin transparent chitin- 

 ous membrane, circular in optical section; aperture end slightly 

 expanded with a short neck; aperture circular, often obHque; body 

 fills test; without vacuoles; pseudopodium short, broadly expand- 

 ed and sometimes cordate; fresh water. 



L. ampullacea W. (Fig. 152, a). Nucleus large, posterior; with 

 green or brown food particles; test 45-55/t by 36-40ju in diame- 

 ter; aperture 15-17/i; among algae. 



Genus Chlamydophrys Cienkowski. Test rigid, circular in sec- 

 tion; aperture often on drawn-out neck; body fills the test; zonal 



