SPIROTRICHA, HYPOTRICHA 



671 



Genus Uroleptus Ehrenberg. Elongate body drawn out into a tail- 

 like portion; 3 f rentals; 2-4 rows of ventral cirri; marginals; no 

 anals; sometimes rose- or violet-colored; fresh or salt water. Many 

 species. 



Fig. 315. a, Hypotrichidium conicum., X200 (Kahl); b, Psilotrlcha 

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

 Umnetis, X240 (Stokes); e, U. longicaudatus, X240 (Stokes); f, U. dispar 

 X240 (Stokes); g, Uroleptopsis citrina, X260 (Kahl); h, Strongylidium 

 calif ornicum, X200 (Kahl); i, Stichotricha secunda, X340 (Kahl); j, 

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



U. Umnetis Stokes (Fig. 315, d). About 200m long; fresh water 

 among vegetation. 



U. longicaudatus S. (Fig. 315, e). About 200/x long; marsh water 

 with sphagnum. 



U. dispar S. (Fig. 315,/). 150-170m long; fresh water. 



U. halseyi Calkins (Fig. 317, a). About 160/i by 20m ; peristome 

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



