334 PROTOZOOLOGY 



section; with many oil (?) globules; filopodium; 34yu by 25m; 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 at- 

 tached foreign bodies; aperture large; nuclei up to 100; pesudo- 

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



D. leidyi G (Fig. 152, j). Test dark gray; inner envelope pro- 

 jecting beyond outer aperture; nuclei up to 20 in number; diame- 

 ter 80-100m. 



Family 3 Difflugiidae Taranek 



Genus Difflugia Leclerc. Test variable in shape, but generally 

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

 diatoms, 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. 153, a). Test 

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

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

 minal, typically circular; test composed of angular sand-grains, 

 diatoms; bright green with chlorophyllous bodies; 60-580^1 by 

 40-240m; in the ooze of freshwater ponds, ditches and bogs; also 

 in moist soil. Several varieties. 



D. urceolata Carter (Fig. 153, h). A large ovoid, rotund test, 

 with a short neck and a rim around aperture; 200-230;u by 150- 

 200ju; in ditches, ponds, sphagnous swamps, etc. 



D. arcula Leidy (Fig. 153, c, d). Test hemispherical, base sHght- 

 ly concave, but not invaginated ; aperture triangular, central, tri- 

 lobed; test yellowish with scattered sand-grains or diatoms, 

 diameter 100-140^*, in sphagnous swamp, moss, soil, etc. 



D. lohostoma Leidy (Fig. 153, e). Test ovoid to subspherical; 

 aperture terminal; with 3-6 lobes; test usually composed of sand- 

 grains, rarely with diatoms; endoplasm colorless or greenish; 

 diameter 80-1 20^; in fresh water. 



D. constrida (Ehrenberg) (Fig. 153, /). Test laterally ovoid, 

 fundus more or less prolonged obliquely upward, rounded, and 

 simple or provided with spines; soil forms generally spineless; 

 aperture antero-inferior, large, circular or oval and its edge in- 



