60 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



face flat, dorsal surface convex ; flexible. Right border of 

 the peristome bending toward the left. Eight sternal 

 cilia ; five ventral and five anal cilia. Without caudal ap- 

 pendages; border cilia often crowded on to the ventral 

 surface. 



Ox. pellionella Miill., Fig. 249. 



Ox. hifaria Stokes, Figs. 250, 256, and 257. 



Ox. fallax Stein, Fig. 251. 



Ox. parvistyla Stein, Figs. 252 and 253. 



Ox. hymenostoma Stokes, Fig. 254. 



Ox.sp. (?),Fig. 255. 



Ox. agiiis Stokes, Fig. 260. 



Ox. sp. ( ?), Fig. 261. 

 Holosticha Wrz. 



This genus is frequently united with Oxytricha, but is 

 here separated by the absence of the regular eight sternal 

 cilia and the presence of two uninterrupted rows of ven- 

 tral cilia. 



H. sp. (?), Fig. 242. 



H. vernalis Stokes, Fig. 244. 



H. setigera (?), Fig. 265. 

 Histrio Sterki. 



Inflexible, similar to Stylonychia, but with a nar- 

 rower peristome, which has its right border turning some- 

 what toward the left. The caudal bristles are wanting. 



H. sp. ( ?) , Fig. 262. 



H. erethisticus Stokes, Fig. 263. 



H. complanatus Stokes, Fig. 264. 

 Stylonychia Ehrbg. 



Inflexible, rarely flexible, with flat ventral and convex 

 dorsal surface. Peristome broadly three-angled, reaching 

 to the middle of the body, or shorter ; its right border not 

 bent toward the left. Eight sternal, five ventral and five 

 anal cilia arranged as in Oxytricha. The middle of the 

 three sternal cilia is immediately behind the right edge of 

 the upper lip. Commonly three large caudal bristles in- 

 terrupting the border cilia. 



St. pustulata Ehrbg., Fig. 258. Not exactly like the de- 

 scribed species. Fig. 266. 



