HOLOTRICHA 503 



about 24 rows of platelets; Geiman (1931) found this organism in 

 an acid marsh pond and noted variation in number and location 

 of accessory spines ; fresh water. 



C. spiralis N. (Fig. 231, e). About 23 longitudinal rows of 

 platelets slightly spirally twisted; posterior spines drawn to- 

 gether; a long caudal cilium; about 50/x long; salt water; Florida. 



C. heteracanthus N. (Fig. 231,/). Anterior processes only on one 

 side; posterior spines; caudal cilium; about 90/x by 35/^; salt wa- 

 ter; Florida. 



Genus Tiarina Bergh. Somewhat similar to Coleps, but pos- 

 terior end tapering to a point; salt water. 



T.fuscus (Claparede et Lachmann) (Fig. 231, g). 85-135^ long. 



Family 5 Actinobolinidae Kent 



Genus Actinobolina Strand {Actinoholus Stein). Ovate or 

 spherical; ciliation uniform; extensible tentacles among cilia; 

 contractile vacuole terminal; macronucleus curved band; fresh 

 water. 



A. vorax (Wenrich) (Fig. 231, h). 100-200^ long; elongate oval 

 to spheroid; Hght yellowish brown in color; Wenrich (1929) found 

 this ciliate in pond water and studied its behavior. 



Genus Dactylochlamys Lauterborn. Body spindle-form, though 

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

 undulating spiral ridges on which tentacle-like processes and 

 long ciUa 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. 231, i). Body 80-120^ long. 



Genus Enchelyomorpha Kahl. Conical, compressed; posterior 

 end broadly rounded; anterior portion narrow; cilia on ring- 

 furrows; anterior half with unretractile short tentacles; cyto- 

 stome not noted; macronucleus with a central endosome sur- 

 rounded by radiating spherules; contractile vacuole terminal, 

 large. 



E. vermicularis (Smith) (Fig. 231, j). Body 30-45/^; fresh and 

 brackish water. 



Family 6 Holophryidae Schouteden 

 Genus Holophrya Ehrenberg. Oval, globose or ellipsoidal; 



