730 PROTOZOOLOGY 



gion slightly curved to left; snout fairly distinct; oral basket with 

 about 16 rods; several contractile vacuoles distributed, a large 

 one terminal; macronucleus large, lenticular, granulated; with a 

 closely attached micro nucleus ; 50-160/x long; fresh water. 



Genus Eucamptocerca da Cunha. Elongate; posterior part drawn 

 out into a caudal prolongation ; dorso-ventrally flattened ; ciliation on 

 both sides; round cytostome with oral basket in anterior ventral sur- 

 face. One species. 



E. longa da C. (Fig. 311, e). 300m by 25m; macronucleus ovoid, with 

 a micro nucleus; contractile vacuole(?); in brackish water (salt con- 

 tent 3 per cent); Brazil. 



Genus Orthodon Gruber. Oval; contractile; colorless; much flat- 

 tened; anterior region curved toward left; striation on both dorsal 

 and ventral sides; cytostome toward right border; oral basket long; 

 macronucleus oval; contractile vacuole terminal; fresh or salt water. 



0. hamatus G. (Fig. 311, /). Extended 200-260/x long, contracted 

 90-150/i long; flask-shaped ; oral basket with 16 trichites; salt water. 



Family 2 Dysteriidae Kent 



Genus Dysteria Huxley (Ervilia Dujardin; Iduna, Aegyria Clapa- 

 rede and Lachmann; Cypridium Kent). Ovate, dorsal surface con- 

 vex, ventral surface flat or concave; left ventral side with nonciliated 

 ventral plate; postoral ciliation is continuation of preoral to right 

 of cytostome and parallel to right margin; cytostome in a furrow 

 near right side; posterior style or spine conspicuous; macronucleus 

 spheroid or ovoid, central; with a micro nucleus; usually 2 contractile 

 vacuoles; fresh or salt water. Numerous species. 



D. calkinsi Kahl (Z). lanceolata Calkins) (Fig. 311, g). About 45m 

 by 27m; salt water; Woods Hole. 



Genus Trochilia Dujardin. Similar to Dysteria; but ciliation on the 

 ventral side in an arched zone; fresh or salt water. Several species. 



T. palustris Stein (Fig. 311, A). 25m long; fresh water. 



Genus Trochilioides Kahl. Rounded at anterior end, narrowed 

 posteriorly; right side more convex than left; cytostome anterior 

 with cytopharynx and preoral membrane; conspicuous longitudinal 

 bands on right half with longitudinal striae, becoming shorter toward 

 left; fresh or salt water. 



T. recta K. (Fig. 311, i). 40-50m long; sapropelic in fresh and brack- 

 ish water. 



Genus Hartmannula Poche (Onychodactylus Entz). Ventral surface 

 uniformly ciliated; cytopharynx with short rods; in salt water. 



H. entzi Kahl (Fig. 311, j). 80-140m long; salt water. 



