260 PROTOZOOLOGY 



Genus Microglena Ehrenberg. Body ovoid to cylindrical; with a 

 firm envelope in the surface of which are embedded many lenticular 

 masses of silica (Conrad, 1928); a single flagellum at anterior end; a 

 reservoir around which four to eight contractile vacuoles occur; a 

 sheet-like chromatophore; stigma; leucosin; fresh water. 



M. ovum Conrad (Fig. 106, a). 31-38ju by 18-25m (Conrad, 1928). 



Genus Pyramidochrysis Pascher. Body form constant; pyriform 

 with 3 longitudinal ridges; flagellate end drawn out; a single chro- 

 matophore; 2 contractile vacuoles; fresh water. 



P. modesta P. (Fig. 104,/). 11-13/z long. 



Genus Sphaleromantis Pascher. Triangular or heart-shaped; 

 highly flattened; slightly plastic; 2 chromatophores; 2 contractile 

 vacuoles ; stigma large; long flagellum; fresh water. 



S. ochracea P. (Fig. 104, g). 6-13m long. 



Genus Kephyrion Pascher. With oval or fusiform lorica ; body fills 

 posterior half of lorica; one chromatophore; a single short flagellum; 

 small; fresh water. Species (Conrad, 1930). 



K. ovum P. (Fig. 104, h). Lorica up to 7 p. by 4;u. 



Genus Chrysopyxis Stein. With lorica of various forms, more or 

 less flattened; 1-2 chromatophores; a flagellum; attached to algae in 

 fresh water. 



C. cyathus Pascher (Fig. 104, i). One chromatophore; flagellum 

 twice body length; lorica 20-25^ by 12-15/x. 



Genus Cyrtophora Pascher. Body inverted pyramid with 6-8 

 axopodia and a single flagellum; with a contractile stalk; a single 

 chromatophore ; a contractile vacuole ; fresh water. 



C. pedicellata P. (Fig. 104, j). Body 18-22julong; axopodia 40-60m 

 long; stalk 50-80;u long. 



Genus Palatinella Lauterborn. Lorica tubular; body heartshaped ; 

 anterior border with 16-20 axopodia; a single flagellum; a chromato- 

 phore; several contractile vacuoles; fresh water. 



P. cyrtophora L. CFig. 104, k). Lorica 80-1 50/z long ; body 20-25/x by 

 18-25ju; axopodia 50/x long. 



Genus Chrysosphaerella Lauterborn. In spherical colony, indivi- 

 dual cell, oval or pyriform, with 2 chromatophores; imbedded in 

 gelatinous mass ; fresh water. 



C. longispina L. (Fig. 104, I). Individuals up to 15^ by 9^; colony 

 up to 250ju in diameter; in standing water rich in vegetation. 



Genus Porochrysis Pascher. Shell with several pores through 

 which rhizopodia are extended ; a flagellum passes through an apical 

 pore; a single small chromatophore; leucosin; a contractile vacuole; 

 fresh water. 



