386 HANDBOOK OF PROTOZOOLOGY 



Oxytricha fallax Stein (Fig. 165, c). In fresh or salt water. 

 About 150 to 180 microns long. 



Genus Stylonychia Ehrenberg. Inflexible body, ovoid or 

 reniform. Ventral surface flat; dorsal convex. Peristome 

 broadly triangular. 8 frontals, 5 ventrals, 5 anals. Usually 3 

 caudals which break up the marginal rows of cilia. Fresh or salt 

 water. 



Stylonychia mytilus (M tiller) (Fig. 165, d). Fresh water and 

 infusion. Body about 85 to 350 microns in length. 



Stylonychia pustulata Ehrenberg (Fig. 165, e). Fresh or salt 

 water. Body about 85 to 210 microns long. 



Stylonychia putrina Stokes (Fig. 165,/). Fresh water. 125 

 to 150 microns long. 



Stylonychia notophora Stokes (Fig. 165, g). Standing water. 

 Body about 125 microns long. 



Genus Urostyla Ehrenberg. Flexible body ellipsoidal; ends 

 rounded. Ventral surface flattened, covered with 5 to 7 longi- 

 tudinal rows of fine cilia, besides two marginal rows. Dorsal 

 side curved. Peristome triangular. Frontals 3 or more, anals 

 5 to 12. A single contractile vacuole and a single macronucleus.. 

 Fresh or salt water. 



Urostyla grandis Ehrenberg (Fig. 165, h). Fresh water. 

 Body 400 to 420 microns in length. 



Genus Kerona Ehrenberg. Body reniform. No caudals. Six 

 oblique rows of ventral cilia. Fresh water. 



Kerona pediculiis (Muller) (Fig. 165, i). On various species 

 of freshwater Hydra. Body 120 to 210 microns in length. 



Genus Epiclintes Stein. Spoon-shape; ventral side flat with 

 5 or 6 rows of cilia. Without caudals. Salt water. 



Epiclintes radiosa Quennerstedt (Fig. 165, j). Body about 

 45 microns long. In salt water. 



Genus Amphisia Sterki. Ovate or ellipsoidal. Two rows of 

 marginal cirri; 2 or 3 rows of ventral cirri; 3 to 5 frontals; 5 to 

 10 anals. Macronucleus double; a single contractile vacuole. 

 Peristome long and narrow; with an undulating membrane on 

 the right margin. Fresh or salt water. 



Amphisia kessleri Wrzesniowski (Fig. 165, k). Marine. 

 About 135 microns long. 



