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 /x. Pond water. 



Fig. 31)3. Eutreptia viridis. X 500- (After Conn.) 



69 (76) With a thick cuticle or lorica 7° 



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 m- Fresh water. 



Fig. 394. 1 rachelomonas 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-Hke neck 

 sometimes present Brown in color. Length 30 to 36 n. Pond 

 water, with other species of the genus. 



'nvOTf ^FZ^"^^^ Fig. 395. Trachelomonas kispida. X 400. (After Conn.) 



75(73.74) Lorica smooth, brown. . Trachelomonas volvocina Ehrenberg iS2,3- 



Lorica nearly spherical, surface smooth, usually without a 

 neck. Flagellum long. Color brown. Diameter 30 m- Very 

 ^^ - "V^ I y common among algae and other aquatic plants. 



Fig. 396. Trachelomonas volvocina. X 450. (After Edmondson.) 



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



77 (78) 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. 

 4r ■ 't'^ y^ \ CV' Endoplasm green, with an eye-spot. Length 



55 p. Fresh water, among diatoms. 



Fig. 397- Chloropeltis hisptdula. X 600. (After 

 Conn.) 



78 (77) Flattened 79 



