700 PROTOZOOLOGY 



S. magna Maupas. Spherical; about 50/x in diameter; numerous 

 tentacles of different length ; nucleus spheroid ; standing fresh water 

 with decaying vegetation. 



S. stentoris M. Parasitic in Stentor; swarmers ciliated on posterior 

 end; the other end with capitate tentacles; nucleus spheroid; 2 con- 

 tractile vacuoles; about 50/i long. 



Genus Paracineta Collin. Spherical to ellipsoidal; tentacles dis- 

 tributed ; mostly in salt water, a few in fresh water. 



P. limbata (Maupas) (Fig. 329, c, d). With or without gelatinous 

 envelope; 20-50/i in diameter; swarmer with many ciliated bands, 

 contractile; on plants and animals in salt water. 



Genus Metacineta Blitschli. Lorica funnel-shaped, lower end 

 drawn out for attachment; tentacles grouped at anterior end; nu- 

 cleus spherical; one contractile vacuole. One species. 



M. mystacina (Ehrenberg) (Fig. 329, e). Lorica up to 700/1 long; 

 in fresh and salt water. 



Genus Urnula Claparede and Lachmann. Lorica colorless; lower 

 end pointed, attached; aperture narrowed, round or triangular; body 

 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. 329,/). Up to 80^ long; on Epistylis, 

 Dendrosoma, etc. 



Genus Lecanophrya Kahl. 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. 329, g). 40-70^ 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. 

 709) ; salt water. One species. 



0. capitatum W. (Fig. 329, h). About 55^1 long; tentacle up to 100)u 

 by L 5-5/1 ; Vancouver. 



Family 5 Acinetidae Butschli 



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. 



A. tuherosa E. (Fig. 330, a). Lorica 50-100/x high; with stalk; salt 

 and brackish water. 



