TESTACEA 239 



rounded. Pseudopodia drawn out to a point. Fresh water 

 bodies. 



Phryganella acropodia (Hertwig and Lesser) (Fig. 95, j). 

 Test circular in aperture view; hemispherical in profile. Yel- 

 lowish or brownish, semi-transparent, and covered with sand- 

 grains and scales. Aperture terminal. In aperture view, the 

 sharply pointed pseudopodia radiating. Colorless endoplasm 

 contains a single nucleus and a variable number of chlorophyl- 

 lous bodies. Diameter 30 to 50 microns. In the sphagnous ooze 

 of ponds and ditches. 



Genus BuUinula Penard. Test ellipsoidal, flattened on one 

 face, with silicious plates. On the flattened surface, oo- shaped 

 aperture. A single nucleus; pseudopodia digitate or spatulate, 

 simple or branched. 



BuUinula indica Penard (Fig. 95, k). Test dark brownish. 

 Diameter 140 to 250 microns. In sphagnum and other mosses. 



Genus Heleopera Leidy. Test variable in color; fundus 

 hemi-spherical, almost always with sand-grains. Test surface 

 covered with amorphous scales, often overlapping. Aperture 

 truncate, narrow, elliptic, notched in narrow lateral view. 

 A single nucleus; pseudopodia variable in number, thin, digi- 

 tate or branching. Fresh water. 



Heleopera petricola Leidy (Fig. 95, l). Test variable in size 

 and color, strongly compressed; fundus rough with sand-grains 

 of various size. Aperture linear or elliptic, its edge thin, convex 

 in front view. A single nucleus posterior. Pseudopodia numer- 

 ous, slender, branching. Length 80 to 100 microns. In sphag- 

 num and boggy places. 



Genus Averintzia Schouteden. Test similar to that of 

 Heleopera, but small aperture elliptical. Test thickened around 

 the aperture. 



Averintzia cyclostoma (Penard). Test dark violet color, with 

 sand-grains of different size; elliptical in cross-section. Pseudo- 

 podia unobserved. Length 135 to 180 microns. In sphagnum 

 and other aquatic plants. 



Family 4 Euglyphidae Wallich 



Genus Euglypha Dujardin. Test hyaline, ovoid, composed 

 of circular, oval, or scutiform silicious imbricated scales, ar- 



