252 



FRESH-WATER BIOLOGY 



68 (63) Flagella two; body spindle-shaped when extended; chromatophores 



disk-shaped Eutreptia Perty. 



Representative species Eutreptia viridis Perty 1852. 



Body very changeable in form. Flagella equalling the 

 body in length. Eye-spot present. Length, when extended, 

 100 /*. Pond water. 



FIG. 393. Eutreptia viridis. X 500. (After Conn.) 



69 (76) With a thick cuticle or lorica 70 



70 (76) Lorica present .'' . . . 71 



71(72) Lorica beaker-shaped or tube-shaped Ascoglena Stein. 



72 (71) Lorica spherical or cylindrical, smooth or spiny. 



Trachelomonas Ehrenberg . . 73 



73 (74> 75) Lorica smooth, colorless . . Trachelomonas lagenella Stein 1878. 



Lorica colorless, oval or elliptical, smooth. An obliquely projecting neck. 

 Length 20 to 35 /* Fresh water. 



FIG. 394. 'Jrachelomonas lagenella. X 600. (After Stein.) 



74 (73, 73) Lorica spinous, brown. 



. Trachelomonas hispida Stein 1878. 



Lorica elongate-oval, with ends broadly rounded. Surface cov- 

 ered with minute, sharp-pointed spines. A short, tube-like neck 

 sometimes present. Brown in color. Length 30 to 36 /*, Pond 

 water, with other species of the genus. 



FIG. 395. Trachelomonas hispida. X 400. (After Conn.) 



75 (73 74) Lorica smooth, brown. . Trachelomonas vohocina Ehrenberg 1833. 



Lorica nearly spherical, surface smooth, usually without a 

 neck. Flagellum long. Color brown. Diameter 30 /* Very 

 common among algae and other aquatic plants. 



FIG. 396. Trachelomonas vohocina. X 450. (After Edmondson.) 



76(69) With a thick cuticle but no lorica 77 



77 (7 8 ) Not flattened, ellipsoidal, with a pointed caudal process. 



Chloropeltis Stein. 

 Representative species Chloropeltis hispidula Stein 1878. 



Surface of the body ornamented with mi- 

 nute spines arranged in longitudinal rows. 

 Endoplasm green, with an eye-spot. Length 

 SS *. Fresh water, among diatoms. 



FIG. 397. Chloropeltis hispidula. X 600. (After 

 Conn.) 



78 (77) Flattened. 79 



