Chapter 32 



Order 1 Holotricha Stein (continued) 



Suborder 2 Gymnostomata Biitschli (continued) 

 Tribe 2 Pleurostomata Schewiakoff 



Cytostome on convex ventral surface 



Cytostome a long slit Family 1 Amphileptidae 



Cj^tostome round, at base of trichocyst-bearing neck 



Family 2 Tracheliidae (p. 519) 



Cytostome on concave ventral side Family 3 Loxodidae (p. 521) 



Family 1 Amphileptidae Schouteden 



Genus Amphileptus Ehrenberg. Flask-shaped; somewhat com- 

 pressed; ciliation uniform and complete; slit-like cytostome not 

 reaching the middle of body; without trichocyst-borders ; many 

 contractile vacuoles; 2 or more macronuclei; fresh or salt water. 



A. claparedei Stein (A. rneleagris Claparede et Lachmann) 

 (Fig. 238, a). Slightly flattened; broadly flask-shaped; with round 

 posterior and neck-like anterior end; cytostome about 2/5 from 

 ventral margin; trichocysts indistinct; dorsal ciliary rows also 

 not distinct; contractile vacuoles irregularly distributed; 120- 

 150^1 long; fresh and salt water, on stalks of Zoothamnium, 

 Carchesium, Epistylis, etc. 



A. hranchiarum Wenrich (Fig. 238, h). On integument and gills 

 of frog tadpoles; swimming individuals killed with iodine, 100- 

 135m by 40-60m. 



Genus Lionotus Wrzeniowski {Hemiophrys W.). Flask-shape; 

 elongate, flattened; anterior region neck-like; cilia only on right 

 side; without trichocyst-borders; cytostome with trichocysts; 

 1 (terminal) or many (in 1-2 rows) contractile vacuoles; 2 macro- 

 nuclei; I micronucleus; fresh or salt water. 



L. fasciola (Ehrenberg) (Fig. 238, c). Elongate flask in form; 

 hyaline; with flattened neck and tail, both of which are moder- 

 ately contractile ; posterior end bluntly rounded ; without tricho- 

 cysts; neck stout, bent toward the dorsal side; cytostome a long 

 slit; contractile vacuole posterior; 2 spherical macronuclei be- 

 tween which a micronucleus is located; IOO/jl long; fresh water and 

 probably also in salt water. 



517 



