870 PROTOZOOLOGY 



more or less filling lorica; 1-2 (up to 5) long active tentacles; nucleus 

 central, oval; one or more contractile vacuoles; fresh water. 



U. epistylidis C. and L. (Fig. 369,/). Up to 80/x long; on Epistylis, 

 Dendrosoma, etc. 



Genus LecanophryaKahl. Body rounded rectangular in cross sec- 

 tion; anterior region bowl-shaped; somewhat rigid tentacles located 

 on the inner surface of bowl; salt water. 



L. drosera K. (Fig. 369, g). 40-70m high; hollow stalk; tentacles in 

 3-5 indistinct rows; attached to the antennae of the copepod, 

 Nitocra typica. 



Genus Ophryocephalus Wailes. Spheroidal, stalked; a single long 

 mobile, capitate tentacle; multiplication by multiple exogenous bud- 

 ding from apical region; on Ephelota gemmipara and E. coronata (p. 

 877) ; salt water. One species. 



0. capitatum W. (Fig. 369, h). About 55m long; tentacle up to 10G> 

 by 1.5-5/z; Vancouver. 



Family 5 Acinetidae Biitschli 



Genus Acineta Ehrenberg. Lorica more or less flattened; usually 

 with stalk; tentacles in 2 (1 or 3) fascicles; body completely or partly 

 filling lorica; swarmer with ciliated band or completely ciliated ; fresh 

 or salt water. Numerous species (Swarczewsky, 1928a). 



A. tuberosa E. (Fig. 370, a). Lorica 50-100m high; with stalk; salt 

 and brackish water. 



A. cuspidata Stokes (Fig. 370, 6). Lorica cup-shaped; front end 

 with 2 opposing sharp points; lorica 32-42^ high; on Oedogonium in 

 fresh water. 



A. lacuslris S. (Fig. 369, i). Lorica elongate ovoid; flattened; 75- 

 185^ high; on Anacharis in pond. 



Genus Tokophrya Biitschli. Pyriform or pyramidal; without lo- 

 rica; tentacles in 1-4 fascicles on anterior surface; stalk not rigid; 

 simple endogenous budding; fresh water. Several species. 



T. infusionum (Stein) (Fig. 370, c-e). Inverted pyramid ; stalk with 

 or without attaching disk; macronucleus oval; 2 contractile vacuoles; 

 about 60m long. Relation between contractile vacuole and feeding 

 (Rudzinska and Chambers, 1951); life span (Rudzinska, 1951). 



T. cyclopum (Claparede and Lachmann) (Fig. 370, /). Oval or 

 spherical; stalk short; tentacles in 2-5 bundles; macronucleus spheri- 

 cal; 1-2 contractile vacuoles; about 50/x long; on Cyclops, etc. 



Genus Thecacineta Collin. Lorica with free margin; body usually 

 attached to bottom of lorica, more or less long; tentacles from an- 

 terior end; salt water. Several species (Swarczewsky, 1928). 



