384 PROTOZOOLOGY 



Genus Microcorycia Cockerell. Test discoidal or hemispherical, 

 flexible, with a diaphanous continuation or fringe around periphery, 

 being folded together or completely closed; crown of test with cir- 

 cular or radial ridges; body does not fill the test; 1-2 nuclei; pseu- 

 dopodia lobular or digitate; fresh water. A few species. 



M. flava (Greeff) (Fig. 179, e, /). Test yellowish brown; crown 

 with few small foreign bodies; endoplasm with yellowish brown 

 granules; 2 nuclei; contractile vacuoles; diameter 80-1 00/^; young 

 individuals as small as 20^; in moss. 



Genus Parmulina Penard. Test ovoid, chitinoid with foreign 

 bodies; aperture may be closed; a single nucleus; 1 or more contrac- 

 tile vacuoles; fresh water. A few species. 



P. cyathus P. (Fig. 179, g, h). Test small, flexible; ovoid in aper- 

 ture view, semicircular in profile; aperture a long, narrow slit when 

 test is closed, but circular or elliptical when opened; 40-55/1 long; 

 in moss. 



Genus Capsellina Penard. Test hyaline, ovoid, membranous; 

 with or without a second outer covering; aperture long slit; a single 

 nucleus; 1 or more contractile vacuoles; filose pseudopodia; fresh 

 water. 



C. timida Brown (Fig. 179, j). Small, ovoid; elliptical in cross- 

 section; with many oil (?) globules; filo podium; 34/^ by 25/^; in moss. 



Genus Diplochlamys Greeff. Test hemispherical or cup-shaped, 

 flexible with a double envelope; inner envelope a membranous sack 

 with an elastic aperture; outer envelope with loosely attached for- 

 eign bodies; aperture large; nuclei up to 100; pseudopodia few, 

 short, digitate or pointed; fresh water. Several species. 



D. leidyi G. (Fig. 179, i). Test dark gray; inner envelope project- 

 ing beyond outer aperture; nuclei up to 20 in number; diameter 

 80-100^. 



Family 3 Difflugiidae Taranek 



Genus Difflugia Leclerc. Test variable in shape, but generally 

 circular in cross-section; composed of cemented quartz-sand, di- 

 atoms, and other foreign bodies; aperture terminal; often with 

 zoochlorellae; cytoplasmic body almost fills the test; a single nu- 

 cleus; many contractile vacuoles; pseudopodia cylindrical, simple 

 or branching; end rounded or pointed; fresh water, woodland soil, 

 etc. 



D. oblonga Ehrenberg (D. pyriformis Perty) (Fig. 180, a). Test 

 pyriform, flask-shaped, or ovoid; neck variable in length; fundus 

 rounded, with occasionally 1-3 conical processes; aperture terminal, 



