36 PROTOZOA 



1. CYATHOMONAS Fromentel. Body colorless, ovoid, flattened, with 

 obliquely truncated forward end, with 2 flagella of nearly equal length; 

 parallel with the anterior border is a row of highly retractile bodies: 

 1 species. 



C. truncata (Fresenius) (Fig. 44). Length .023 mm.: in fresh 

 water and infusions. 



2. CHILOMONAS Ehrenberg. Body colorless, oval, compressed; for- 

 ward end obliquely notched, with two equally long flagella: 2 species; 

 in fresh water and infusions. 



Fig. 44 Fig. 45 Fig. 46 



Fig. 44 Cyathomonas truncata (Conn). Fig. 45 Chilomonas paramecium (Conn). 

 Fig. 46 Chlamydomonas pulvisculus (Conn). 



C. paramecium Ehr. (Fig. 45). Body ellipsoid; length .03 mm.: 

 very common. 



3. CRYPTOMONAS Ehrenberg. Like Chilomonas, but with 2 green or 

 brown chromatophores : 2 species; in fresh and salt water. 



C. ovata Ehr. Length .03 mm.: in fresh water, to which it may 

 give a fishy taste. 



SUBORDER 2. CHLAMYDOMONADINA. 



Body green in color with 2 or 4 flagella and usually a firm cuticula 

 or shell within which division takes place: 2 families. 



FAMILY CHLAMYDOMONADIDAE. 



Cuticula very delicate with no large pores: 7 genera. 



1. CHLAMYDOMONAS* Ehrenberg. Body spherical to cylindrical 

 with 2 flagella and an eye-spot, a delicate shell, prominent chromato- 

 phores and 2 contractile vacuoles: about 6 species; in fresh water. 



C. pulvisculus Ehr. (Fig. 46). Body spherical, about .02 mm. in 

 diameter: in fresh water, to which it gives an oily flavor. 



2. SPONDYLOMORTJM Ehrenberg. Colony of 16 cells in 4 alternating 

 rows, each cell with 4 flagella: 1 species. 



S. quaternarium Ehr. Diameter of colony .05 mm. : in fresh water. 



3. POLYTOMA Ehrenberg. Body ellipsoid with a delicate shell and 

 2 flagella, colorless, occasionally with an eye-spot ; 2 contractile vacuoles ; 



* See "Chlamydomonas and Its Effect on Water Supplies," by G. C. Whipple, 

 Trans. Am. Micro. Soc., Vol. 21, p. 97, 1900. 



