506 PROTOZOOLOGY 



Genus Urotricha Claparede et Lachmann (Balanitozoon 

 Stokes). Body oval to ellipsoidal or conical; with 1 or more longer 

 caudal cilia; ciliation uniform, except posterior region which may 

 be without ciha; cytostome at or near anterior end, surrounded 

 by ring of heavier cilia; contractile vacuole, posterior; macro- 

 nucleus spherical; fresh water. 



U. agilis (Stokes) (Fig. 233, d). Body small; about 15-20/x 

 long; swimming as well as leaping movement; standing fresh 

 water with sphagnum. 



U. farcta C. et L. (Fig. 233, e). Body 20-30^ long; fresh water; 

 Kahl considers U. parvula Penard and Balanitozoon gyrans 

 Stokes are identical with this species. 



Genus Plagiocampa Schewiakoff. Ovoid, spindle-form or cylin- 

 drical; slightly asymmetrical; cytostome at anterior end in a slit; 

 right ridge thickened and lip-like, with about 8 long cilia; with 

 or without long caudal cilium; fresh or salt water. Several species. 



P. marina Kahl (Fig. 233,/, g). Cylindrical; oval macronucleus 

 central; contractile vacuole terminal; a caudal cilium; 55-90m 

 long; salt water; Florida (Noland). 



Genus Chilophrya Kahl. Ovoid or ellipsoid; cytostome at 

 anterior end, surrounded by protrusible rods; on one side there is 

 a lip-like ectoplasmic projection; fresh or salt water. 



C. (Prorodon) utahensis (Pack) (Fig. 233, h). Body ellipsoid, 

 somewhat asymmetrical; comparatively small number of furrows; 

 ciliation uniform; a finger-like process in front of cytostome; 

 macronucleus small, central; contractile vacuole terminal; endo- 

 plasm with zoochlorellae; encystment common; cysts highly 

 sensitive to light; 50/x long; Great Salt Lake; Utah (Pack). 



C. ( Urotricha) labiata (Edmondson) (Fig. 233, i). Body ovoid; 

 a lip-like process in front of cytostome; macronucleus oblong, 

 central; contractile vacuole terminal; 30^ long; fresh water. 



Genus Platyophrya Kahl. Compressed; flask-like or elongate 

 ovoid; asymmetrical; dorsal surface convex, ventral surface flat 

 or partly concave; spiral striation; position and direction of 

 cytostome variable; macronucleus round; contractile vacuole 

 terminal; fresh water. 



P. lata K. (Fig. 233, j). Highly compressed; colorless; many 

 striae; on left edge of cytostome 5-6 cirrus-like projections and 

 on right edge many short bristles; 105^ long; fresh water with 

 sphagnum. 



