SPIROTRICHA, HYPOTRICHA 



833 



scattered; 5 anals; marginals at some distance from lateral borders, 

 interrupted posteriorly ; fresh or salt water. 



T. parvistyla S. (Fig. 354, e). 10 frontals scattered; about 63 n long; 

 in shallow freshwater pools. 



Genus Urosoma Kowalewski. Similar to Oxytricha; but posterior 

 portion drawn out and much narrowed ; fresh water. 



U. caudata (Stokes) (Fig. 354, /). 200-250/1 long; pond water. 



Genus Amphisiella Gourret and Roeser. With a single row of 

 ventrals and 2 marginal rows; salt or fresh water. Several species. 



A. thiophaga (Kahl) (Fig. 354, g). 70-100^ long; salt water. 



Genus Eschaneustyla Stokes. Elliptical or ovate; narrow peri- 



Fig. 354. a, Oxytricha fallax, X230 (Stein); b, O. bifaria, X180 (Stokes); 

 c, O. ludibunda, X400 (Stokes); d, O. setigera, XS70 (Stokes); e, Tachy- 

 soma parvistyla, X490 (Stokes); f, Urosoma caudata, X250 (Stokes); 

 g, Amphisiella thiophaga, X380 (Kahl); h, Eschaneustyla brachytona, 

 X240 (Stokes); i, Gonostomum strenuum, X160 (Engelmann) ; ],Hemi- 

 cycliostyla sphagni, X100 (Stokes); k, 1, Cladotricha koltzowii (k, X170; 

 1, X300) (Kahl). 



