22 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



in flagellate stage, and by pseudopodia in the amoeboid 

 stage. One or two contractile vacuoles, one lying in front 

 and the other behind; nucleus anterior. 

 C. mutabilis ( ?) Stokes, Fig. 36. 

 Cercomonas Duj. 



Form spherical to spindle-shaped, colorless. A single 

 long anterior flagellum. Body prolonged posteriorly into 

 a caudal process. Pseudopodia frequently seen, particu- 

 larly near the caudal process. Nucleus in anterior half 

 of body ; one or more vacuoles. 

 C. longicaiidata Duj., Fig. 34. 

 C. crassicauda Duj., Fig. 35. 

 Oikomonas S. K. 



Very small. Free swimming or attached by a proto- 

 plasmic filament. Spherical, oval, or amoeboid. With one 

 flagellum on anterior end and near by frequently a pro- 

 jecting lip which serves for taking food. Nucleus and 

 contractile vacuole present. 

 O.sp (?), Fig. 40. 

 O. sp ( ?), Fig. 40a. 

 Notosolenus Stokes. 



Oval or angular ; flattened dorso-ventrally with dorsal 

 side concave. Rigid. One long flagellum carried ob- 

 liquely and stiffly in front, and a shorter one only ^ the 

 length of the body directed backwards and commonly not 

 visible. Mouth near base of flagellum. Contractile 

 vacuole double. 

 N. orbicularis Stokes, Fig. 37. 

 N.sp (?),Fig. 38. 

 N.sp (?),Fig. 39. 

 Monas Ehrbg. Stein. 



Solitary ; spherical to ovate. Occasionally fastened by 

 a delicate stalk-like posterior end. With one chief flagel- 

 lum and one or secondary flagella. A mouth projection 

 and occasionally an eye-spot present. A nucleus near the 

 flagellum and one or two contractile vacuoles. 

 M. (Physomonas) elongata (?) Stokes, Fig. 41. Attached 

 and free. 



