HOLOTRICHA 731 



Family 3 Chlamydodontidae Claus 



Genus Chlamydodon Ehrenberg. Ellipsoid, reniform, elongate tri- 

 angular, etc. ; cilia only on ventral surface, anterior cilia longer; cyto- 

 stome 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. 311, k). Ellipsoid or reniform; right side 

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

 vex; a band of trichites, 'railroad track,' parallel to body outline; oral 

 basket with 8-10 rods; macro nucleus oval; 4-5 contractile vacuoles 

 distributed; 60-90/x 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 surafce narrowed laterally behind 

 cytostome, forming V-shaped ciliated area (about 12 rows); cyto- 

 stome ellipsoid with oral basket; macronucleus oval with a micro- 

 nucleus; 2 contractile vacuoles; fresh water. 



P. vorticella S. (Fig. 311, l). 80-1 10m long; cytostome covered by a 

 slit-bearing membrane; with 2 preoral membranes; macronucleus 

 ovoid; fresh water. 



Genus Cryptopharynx Kahl. Ellipsoid, anterior third bent to left; 

 ventral surface flat, dorsal surface with hump; spiral interciliary fur- 

 rows ridged; oval cytostome at anterior end; no cytopharynx; dorsal 

 hump yellowish, granulated with gelatinous cover; 2 macro nuclei; 1 

 micro nucleus; 2 contractile vacuoles, one posterior and the other to- 

 ward left side at the bend of body. One species. 



C. setigerus K. (Fig. 312, a, b). Elongate ellipsoid; anterior region 

 bent to left; ventral surface flat, dorsal surface with a hump; about 

 15 ventral ciliary rows; 2 vesicular macronuclei and 1 micronucleus 

 dorso-central; 33-96/x by 21-45m (Kirby). Kirby (1934) found the 

 organism in salt marsh pools (salinity 1.2-9.7 per cent) with purple 

 bacteria; California. 



Genus Chilodonella Strand (Chilodon Ehrenberg). Ovoid; dorso- 

 ventrally flattened; dorsal surface convex, ventral surface flat; ven- 

 tral surface with ciliary rows; anteriorly flattened dorsal surface with 

 a cross-row of bristles; cytostome round; oral basket conspicuous, 

 protrusible; macronucleus rounded; contractile vacuoles variable in 

 number; fresh or salt water or ectocommensal on fish and amphi- 

 pods. Many species. 



