MASTIGOPHORA, CHRYSOMONADINA 175 



With calcareous or silicious shell 



Bearing calcareous discs and rods. .Family 4 Coccolithidae (p. 181) 

 Bearing silicious skeleton Family 5 Silicoflagellidae (p. 181) 



Family 1 Chromulinidae Engler 



Minute forms, naked or with sculptured shell; with a single 

 flagellum; often with rhizopodia; a few colonial; free-swimming 

 or attached. 



Genus Chromulina Cienkowski. Oval; round in cross-section; 

 amoeboid; 1-2 chromatophores; palmella stage often large; in 

 fresh water. Numerous species. The presence of a large number 

 of these organisms gives a golden-brown color to the surface of 

 the water. 



C. pascheri Hofeneder (Fig. 85, a, h). 15-20/i in diameter. 



Genus Chrysapsis Pascher. Solitary; plastic or rigid; chromato- 

 phore diffused or branching; with stigma; amoeboid movement; 

 holophytic, holozoic; fresh water. 



C. sagene P. (Fig. 85, c). Anterior region actively plastic; stigma 

 small; 8-14/i long; flagellum about 30/u long. 



Genus Chrysococcus Klebs. Shell spheroidal or ovoidal, smooth 

 or sculptured and often brown-colored; through an opening a 

 flagellum protrudes; 1-2 chromatophores; one of the daughter 

 individuals formed by binary fission leaves the parent shell and 

 forms a new one; fresh water. 



C. ornatus Pascher (Fig. 85, d). 14-16m by T-lO/x. 



Genus Mallomonas Perty {Pseudomallomonas Chodat). Body 

 elongated; with silicious scales and often spines; 2 chromato- 

 phores, rod-shaped; fresh water. Numerous species. 



M. litomosa Stokes (Fig. 85, e). Scales very dehcate, needle-like 

 projections at both ends; flagellum as long as body; 24-3 2/i by 8m. 



Genus Pyramidochrysis Pascher. Body form constant; pyri- 

 form with 3 longitudinal ridges; flagellate end drawn out; a 

 single chromatophore; 2 contractile vacuoles; fresh water. 



P. modesta P. (Fig. 85,/). 11-13/x long. 



Genus Sphaleromantis Pascher. Triangular or heart-shaped; 

 highly flattened; shghtly plastic; 2 chromatophores; 2 contractile 

 vacuoles; stigma large; long flagellum; fresh water. 



S. ochracea P. (Fig. 85, g). 6-13/x long. 



Genus Kephyrion Pascher. With oval or fusiform lorica; body 

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

 flagellum; small; fresh water. 



