HELIOZOA 



253 



cal, openings minute, surrounded by polyhedral facets or ridges. 

 With stalk. Solitary or colonial. Thiee species. 



Hedriocystis reticulata Penard (Fig. 101, h). Envelope 

 colorless or pale yellow, proliferations regularly polygonal with 

 raised borders. Stalk solid, straight; a single nucleus, located 

 near the center; one contractile vacuole. Axopodia(?), each 

 arising from a pore in the center of a facet. Solitary. Capsule 

 about 25 microns in diameter; body about 12 microns in diam- 

 eter; stalk about 70 microns long by 1 to 1.5 microns in width. 

 In marshy pools. 



Genus Choanocystis Penard. Spherical envelope with per- 

 forations which possess conical borders; the openings of the 

 cones are provided with funnel-like extensions, the edges of 

 which nearly touch one another. 



Fig. 101 a. Clathrulina elegans. X165 (After Leidy). 



b. Hedriocystis reticulata. X330 (After Brown from Cash). 



c. Choanocystis lepidula. X460 (After Penard). 



Choanocystis lepidula Penard (Fig. 101, c). Diameter 10 

 to 13 microns. In freshwater body. 



References 



Belar, K. 1922, 1924 Untersuchungen an Actinophrys sol 



Ehrenberg. I, II. Arch. f. Protistenk., Vols. 46, 48. 

 Cash, J. and G. H. Wailes. 1921 The British freshwater 



Rhizopoda and Heliozoa. Vol. 5. London. 

 KtJHN, A. 1926 Morphologic der Tiere in Bildern. 2 H., 2 T. 



Rhizopoden. Berlin. 

 Leidy, J. 1879 Freshwater Rhizopods of North America. 



Rep. U. S. Geol. Survey. Vol. 12. 

 Penard, E. 1904 Les Heliozoaires d'eau douce. Geneva. 



1905 Les Sarcodines des Grands Lacs. Geneva. 



