SPIROTRICHA, HYPOTRICHA 



S3 5 



U. longicaudatus S. (Fig. 355, e). About 200/* long; marsh water 

 with sphagnum. 



U. halseyi Calkins (Fig. 355,/). About 160/t by 20/*; peristome 

 1/6-1/7 the body length; 3 ventrals; macronucleus divided into 

 many (up to 26) parts; 2 (1-3) micronuclei; fresh water (Calkins, 

 1930). 



Genus Uroleptopsis Kahl. Ventrals in 2 uninterrupted rows; salt 

 water. A few species. 



Fig. 355. a, Hypotrichidium conicum, X200 (Kahl); b, Psilotricha 

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

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

 X470 (Calkins); g, Uroleptopsis citrina, X260 (Kahl); h, Strongylidium 

 calif or nicum, X200 (Kahl); i, Stichotricha secunda, X340 (Kahl); j, S. 

 intermedia (Froud); k, Chaetospira mulleri (Froud); 1, Urostyla grandis, 

 X140 (Stein); m, U. trichogaster, XI 50 (Kahl). 



