SPIROTRICHA, HYPOTRICHA 



607 



Fig, 274. a, Hypotrichidium conicum, X200 (Kahl); b, Psilotricha 

 acuminata, X230 (Stein); c, Kahlia acrobates, X240 (Kahl); d, Urolep- 

 tus limnetis, X240 (Stokes); e, U. longicaudatus, X240 (Stokes); f, U. 

 dispar, X240 (Stokes); g, Uroleptopsis citrina, X260 (Kahl); h, Stron- 

 gylidium californicutn, X200 (Kahl); i, Stichotricha secunda, X340 

 (Kahl); j, Urostyla grandis, Xl40 (Stein); k, U. trichogaster, Xl50 

 (Kahl). 



U. grandis E. (Figs. 45; 274:, j). 300-400^ long; macronucleus 

 in 100 or more parts; 6-8 micronuclei; fresh water. 



U. trichogaster Stokes (Fig. 274, k). 250-330ai long; fresh water. 



U. caudata S. (Fig. 275, a). Elongate ellipsoid; flexible; nar- 

 rowed anterior part bent to left; peristome 1/3 the body length; 

 macronucleus in many parts; contractile vacuoles on left margin; 

 about 600m long; fresh water with sphagnum. 



Genus Kerona Ehrenberg. Reniform; no caudals; 6 obhque 

 rows of ventral cirri; commensal. One species. 



