708 PROTOZOOLOGY 



ciliary rows; about 30 tentacles in each ciliary row; tentacles may be 

 extended to twice the diameter of the body or be completely with- 

 drawn; feeds chiefly on rotifers which stop all movements as though 

 completely paralyzed upon coming in contact with the tentacles 

 (Wenrich, 1929a). 



Genus Dactylochlamys Lauterborn. Body spindle-form, though 

 variable; posterior end drawn out into tail; pellicle with 8-12 un- 

 dulating spiral ridges on which tentacle-like processes and long cilia 

 are alternately situated; these processes are retractile (Kahl) and 

 similar in structure to those of Suctoria; cytostome has not been 

 detected; possibly allied to Suctoria; fresh water. One species. 



D. pisciformis L. (Fig. 302, i). Body 80-120/x long. 



Genus Enchelyomorpha Kahl. Conical, compressed; posterior end 

 broadly rounded; anterior portion narrow; cilia on ring-furrows; an- 

 terior half with unretractile short tentacles; cytostome not noted; 

 macro nucleus with a central endosome surrounded by spherules; 

 contractile vacuole terminal, large. 



E. vermicularis (Smith) (Fig. 302, j). Body 30-45/x ; fresh and brack- 

 ish water. 



Family 6 Holophryidae Schouteden 



Genus Holophrya Ehrenberg. Oval, globose or ellipsoidal; ciliation 

 uniform; sometimes longer cilia at the anterior or posterior region; 

 systostome circular, simple, without any ciliary ring around it; 

 cytopharynx with or without trichites or trichocysts; fresh or salt 

 water. Numerous species. 



H. simplex Schewiakoff (Fig. 304, a). Ellipsoidal; 18-20 ciliary 

 rows; cilia uniformly long; cytostome small; cytopharynx without 

 trichocysts or trichites; contractile vacuole and cytopyge posterior; 

 macronucleus large, round; 34yu by 18/x; fresh water. 



Genus Lagynophrya Kahl. Resembles Holophrya; small elongate 

 ovoid to short cylindrical; one side convex, the other more or less 

 flattened; cytopharynx terminates anteriorly in a small cone-like 

 process which may or may not be distinct; stagnant fresh or salt 

 water. Several species. 



L. mutans K. (Fig. 304, b). Body plastic; oval to cylindrical; 

 colorless; narrowly striated; oval cone hemispherical without any 

 trichocysts; body about 90ju long, when contracted about 65ju in 

 diameter; among decaying leaves in fresh water. 



Genus Ichthyophthirius Fouquet. Body oval; ciliation uniform; 

 pellicle longitudinally striated; cytostome at anterior end, with a 

 short cytopharynx with cilia; horseshoe-shaped macronucleus; 



