586 PROTOZOOLOGY 



C. vorax (Stokes) (Fig. 278, d). Elongate ellipsoid; anterior re- 

 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; 50-160m long; fresh water. 



Genus Eucamptocerca da Cunha. Elongate; posterior part drawn 

 out into a caudal prolongation; do rso-ventrally flattened; ciliation on 

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

 face. One species. 



E. longa da C. (Fig. 278, e). 300/x by 25m; macronucleus ovoid, with 

 a micro nucleus; contractile vacuo le(?); 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. 278, /). Extended 200-260m long, contracted 

 90-150m 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 (D. lanceolata Calkins) (Fig. 278, g). About 45/i 

 by 27m; salt water; Woods Hole. 



Genus Trochilia Dujardin. Similar to Dysteria; but ciliated right 

 ventral side free; fresh or salt water. Several species. 



T. palustris Stein (Fig. 278, h). 25m long; fresh water. 



Genus Trochilioides Kahl. Rounded at anterior end, narrowed 

 posteriorly; right side more convex than left; cytostome anterior 

 with cyto pharynx and preoral membrane; conspicuous longitudinal 

 bands on right half with longitudinal striae, becoming shorter toward 

 left; fresh or salt water. 



T. recta K. (Fig. 278, i). 40-50m long; sapropelic in fresh and brack- 

 ish water. 



