58 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Urostyla Ehrbg. 



Elliptical to ovate, both ends rounded. Ventral sur- 

 face flat, dorsal surface curved ; body flexible. Three or 

 more bristle-like sternal cilia and five or more longitudi- 

 nal rows of ventral cilia, those on the sternum especially 

 developed, while those on the rest of the body are smaller. 

 Commonly five to twelve anal cilia in an oblique row, ex- 

 tending to the left. Peristome an elongated triangle with 

 an undulating membrane. Two or more nuclei. 

 U. trichota {Hcmiclostyla of Stokes), Fig. 237. 

 U. vernalis ( ?) Stokes, Fig. 239. 



U. trichogastra Stokes, Fig. 241. Perhaps all of these are 

 only varieties of U. grandis Ehrbg. 

 New Genus 



Elongate, rounded at both extremities, not flexible. 

 Peristome on the right hand margin and extending back 

 of the middle, marked by a row of long cilia or mem- 

 branellse, that bends to the left to lead to the mouth. Be- 

 sides border cilia there are four oblique rows of cilia upon 

 the ventral surface. Nuclei, four in number ; contratile 

 vacuole single. 



The interesting animal shown in Fig. 279 does not 

 agree with any described genus. Two specimens have 

 been found. 

 Stichotricha Perty. 



^ Elongated, narrowed in front, rounded behind, with a 

 body nearly cylindrical and very contractile. Peristome 

 narrow, upon the left side, extending to the middle or 

 even back of it. Membranella; long, the two or three 

 anterior ones extending over the front end of the body 

 as bristles. The border cilia extend uninterruptedly 

 around the posterior end. Sternal and anal cilia wanting. 

 St. secunda Perty, Fig. 236. 

 Uroleptus Ehrbg. 



Sometimes contractile, sometimes not ; elongated, nar- 

 row, cylindrical or flattened. Anterior end rounded, pos- 

 terior end prolonged into a caudal projection. Three 

 sternal cilia, two rows of ventral cilia, but no anal cilia. 

 The border cilia pushed on to the ventral surface. Peri- 

 stome about one-third the length of the body. 



