HOLOTRICHA 525 



stome in a furrow near right side; posterior style or spine con- 

 spicuous; macronucleus spheroid or ovoid, central; with a 

 micronucleus; usually 2 contractile vacuoles; fresh or salt water. 

 Numerous species. 



D. calkinsi Kahl (Fig. 240, g). About 45^ by 27 /j,; 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. 240, h). 25^ 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 longi- 

 tudinal bands on right half with longitudinal striae, becoming 

 shorter toward left; fresh or salt water. 



T. recta K. (Fig. 240, i). 40-50^ long; sapropelic in fresh and 

 brackish water. 



Genus Hartmannula Poche (Onchodactylus Entz). Ventral 

 surface uniformly ciHated; cytopharynx with short rods; in salt 

 water. 



H. entzi Kahl (Fig. 240, j). 80-140m long; salt water. 



Family 3 Chlamidodontidae Glaus 



Genus Chlamidodon Ehrenberg. Ellipsoid, reniform, elongate 

 triangular, etc.; cilia only on ventral surface, anterior cilia longer; 

 cytostome elongate oval and covered with a membrane bearing 

 a slit; oral basket made up of closely arranged rods with apical 

 processes; along lateral margin, there is a characteristic striped 

 band which is a canalicule of unknown function; fresh or salt 

 water. 



C. mnemosyne E. (Fig. 240, k). Ellipsoid or reniform; right side 

 convex, left side concave; ventral side flat, dorsal side greatly 

 convex; a band of trichites, 'railroad track,' parallel to body out- 

 line; oral basket with 8-10 rods; macronucleus oval; 4-5 contrac- 

 tile vacuoles distributed; 60-90^ long; salt water. MacDougall 

 (1928) observed it in the brackish water at Woods Hole and 

 studied its neuromotor system. 



Genus Phascolodon Stein. Ovoid; with broad anterior end and 

 bluntly pointed posterior end; ventral side concave or flat, dorsal 

 side convex; ciliated field on ventral surface narrowed laterally 

 behind cytostome, forming V-shaped ciliary area (about 12 rows); 



