FLAGELLATE PROTOZOA (MASTIGOPHORA) 253 



79 (84) Posterior border acute or with a caudal appendage 80 



80 (81) Ellipsoidal, slightly flattened; posterior end acute. Longitudinally 



or spirally marked Lepocindis Perty. 



Representative species Lepocindis sp. 



This genus is very closely related to, if not identical with, the preceding 

 one. The form here represented is assigned to this genus by Conn, with 

 some doubt. Species not determined. 



Fig. 398. Lepocindis sp. x 1000. (After Conn.) 



Round to pear-shaped, asymmetrical, much flattened; caudal process 

 present Phacus Nitzsch . . 82 



Caudal process moderate; not large. 



Phacus pleuronectes Nitzsch 181 6. 



Tail-like projection usually curved. Surface longitudinally striateci. 

 Endoplasm green, enclosing one or more large, amylaceous bodies. Flagel- 

 lum arises from a cleft-like mouth on the anterior border. Length 25 to 

 75 M- Among aquatic plants. 



Fig. 399. Phacus pleuronectes. X 450. (After Conn.) 



83 (82) Caudal process long; size conspicuous. 



Phacus longicaudus Ehrenberg 1838. 



Recognized by its large size and long caudal pro- 

 jection. Body frequently twisted on its longitudinal 

 axis. Length 100 n. 



Fig. 400. Phacus longicaudus. x 310. (.Aifter Conn.) 



84 (79) Posterior end evenly rounded 85 



85 (86) Resembling Phacus but without caudal appendage. 



Cydaiiura Stokes. 

 Representative species Cydanura orhiciilata Stokes 1S86. 



Body ovate or suborbicular, thick, compressed, with a longitudmal 

 keel across the right-hand side. Color green. Contractile vacuole 

 and eye-spot anteriorly placed. Length about 50 /i. Stagnant pond 

 water. 



Fig. 401. Cydanura orbiculata. X 3^5- (After Stokes. J 



86 (85) Oval in outline, rigid, flattened. Chromatophores green, two in 



number, lateral in position. . . . Cryptoglcua Ehrenberg. 



Representative species Cryptoglena pigra EhTcnhcig \^^i. 



Flagellum single, short. Chromatophores band-like, following the 

 contour of the body. \ scarlet eye-six)t near the anterior extremity. 

 Length 1 2 ti. Fresh water. 



Fig. 402. Cryptoglena pigra. X 1500. (After Conn.) 



87 (61) Colorless forms without eye-spots. Often very plastic 88 



88 (loi) Body elongate, usually with striped membrane. Nutrition sapro- 



phytic. Flagella usually two. Family Astasiidae . . 89 



