HOLOTRICHA 



715 



P. ovatus K. (Fig. 305, h). Caudal bristle breaks off easily; body 

 30/n long; fresh water among decaying vegetation. 



Genus Rhopalophrya Kahl. Cylindrical; furrows widely separated; 

 slightly asymmetrical; curved ventrally; dorsal surface convex; 

 ventral surface flat or slightly concave; anterior end with 'neck'; 2 

 spherical macronuclei; fresh or salt water; sapropelic. 



b mSM. .#! 



v.v-' • . .•.•••••'■:-..--.v.,:C".i , ..i" 



Fig. 305. a, Lacrymaria olor, X170 (Roux); b, L. lagenula (contracted), 

 X400 (Calkins); c, L. coronata (contracted), X530 (Calkins); d, Enchelys 

 curvilata, X200 (Smith); e, Crobylura pelagica, X500 (Andr6); f, Micro- 

 regma auduboni X500 (Smith); g, Chaenea limicola, X310 (Penard); h, 

 Pithothorax ovahis, X550 (Kahl); i, Trachelophyllum clavatum, X100 

 (Stokes). 



R. salina Kirby (Fig. 306, a). Cylindrical, tapering gradually to a 

 truncated anterior end, slightly curved ventrally; cilia (6-10/* long) 

 sparsely distributed; 2 macronuclei, spherical; 29-55/z long; 16-21/x 

 in diameter; in concentrated brine (salts "34.8 per cent; pH 9.48") 

 from Searles Lake; California (Kirby, 1934). 



Genus Enchelyodon Clapar&de and Lachmann. Elongated; cy- 



