HOLOTRICHA 511 



Genus Rhopalophrya Kahl. Cylindrical; furrows widely sepa- 

 rated; slightly asymmetrical; curved ventrally; dorsal surface 

 convex; ventral surface flat or slightly concave; anterior end with 

 'neck'; 2 spherical macronuclei; fresh or salt water; sapropelic. 



R. salina Kirby (Fig. 235, a). Cyhndrical, tapering gradually 

 to a truncated anterior end, shghtly curved ventrally; ciha 

 (6-10m long) sparsely distributed; 2 macronuclei, spherical; 

 29-55m l^ong; 16-21/^ in diameter; in concentrated brine (salts 

 34.8 per cent; pH 9.48) from Searles Lake; Cahfornia. 



Genus Enchelyodon Claparede et Lachmann. Elongated; 

 cylindrical, ovoid or flask-shaped; some with head-hke prolonga- 

 tion; cytopharynx with trichites; ciha long at anterior end; fresh 

 or salt water. Several species. 



E. farctus C. et L. (Fig. 21, h). Ellipsoid; ectoplasm thick, 

 yellowish, with trichocyst layer; cilia dense and short; oral cone 

 flat; cytopharynx with about SOju long trichites; macronucleus 

 long; contractile vacuole terminal; 180-400)U long; fresh water 

 among decaying vegetation. 



E. calif ornicus Kahl. 120-130^ long; elongate ovoid to nearly 

 cylindrical; not distinctly flattened; macronucleus horseshoe-Kke, 

 with a large micronucleus ; in mosses; California. 



Genus Trachelophyllum Claparede et Lachmann. Elongate; 

 flattened; flexible, ribbon-like; anterior end neck-Uke and tip 

 truncate, cytopharynx narrow, round in cross-section, with 

 trichocysts; ciliary rows widely apart; 2 macronuclei, each with a 

 micronucleus; contractile vacuole terminal; fresh or salt water. 

 Several species. 



T. clavatum Stokes (Fig. 234, i). About 180m long; fresh water. 



Genus Ileonema Stokes {Monomastix Roux). Body flattened; 

 flask-shaped; somewhat similar to Trachelophyllum, but diifers 

 by the fact that there is a remarkable flagellum-like process ex- 

 tending from anterior end; cytopharynx with trichocysts; fresh 

 water. 



I. dispar S. (Fig. 235, h). Highly contractile; anterior flagellum 

 half body length, whose basal portion spirally furrowed; cyto- 

 stome at base of the flagellum; cytopharynx spindle-form with 

 trichites; 2 contractile vacuoles and cytopyge posterior; ovoid 

 macronucleus; movement slow creeping; about 120/i long; fresh 

 water among algae. 



/. ciliata (Roux) (Fig. 235, c). 75/i by 14^; fresh water. 



Genus Trachelocerca Ehrenberg. Elongate, vermiform or 



