608 



PROTOZOOLOGY 



Fig. 275. a, Urostyla caudata, X90 (Stokes); b, Kerona polyporum, 

 X200 (Stein); c, Keronopsis rubra, X270 (Entz); d, Epiclintes pluvi- 

 alis, XlOO (Smith); e, Holosticha vernalis, X220 (Stokes); f, H. hy- 

 menophora, Xl80 (Stokes); g, Paraholosticha herbicola, X200 (Kahl); 

 h, Trichotaxis stagnatilis, Xl90 (Stokes); i, Balladyna elongala, X800 

 (Roux); j, Pleurotricha lanceolata, X250 (Stein); k, Gastrostyla musco- 

 rum, X200 (Kahl). 



K. polyporum E. (Fig. 275, 6). 120-200/i long; commensal on 

 Hydra, 



Genus Keronopsis Penard. 2 ventral rows of cirri reaching 

 frontal field; caudals variable; macronucleus usually in several 

 (rarely 2) parts; fresh or salt water. Numerous species, 



K. rubra (Ehrenberg) (Fig. 275, c). Reddish; 200-300^ long; 

 salt water. 



Genus Epiclintes Stein. Elongate; spoon-shaped; flattened ven- 



