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HANDBOOK OF PROTOZOOLOGY 



caudals. Band-like macronucleus and a micronucleus. Con- 

 tractile vacuole single. Salt or fresh water. 



Euplotes charon (Miiller) (Fig. 167, a). Fresh or salt water. 

 Body about 80 to 100 microns long. 



Euplotes patella (Miiller) (Fig. 167, b). Fresh or salt water. 

 Body about 130 microns long. 



Genus Uronychia Stein. Without frontals or caudals. 

 Marine. 



Fig. 167 a. Euplotes charon. X500 (After Calkins). 



b. E. patella. X150 (After Stein). 



c. Uronychia setigera. X650 (After Calkins). 



d. Diophrys appendiculatus. X500 (After Calkins). 



Uronychia setigera Calkins (Fig. 167, c). Salt water. Body 

 about 40 microns long. 



Genus Diophrys Dujardin. Peristome long, reaching the 

 row of anal ciri. Three posterior giant cirri; 7 to 8 frontal-vent- 

 rals. Marine. 



Diophrys appendiculatus Stein (Fig. 167, d). Marine. 

 Body about 50 microns long. 



Family 4 Aspidiscidae Stein 



Genus Aspidisca Ehrenberg. Body small, inflexible, oval. 

 Right side convex. Ventral side flattened; dorsal side convex. 

 Adoral zone runs more or less straight. Seven ventrals; 5 anals. 

 Macronucleus ring or horseshoe shape. A single contractile 

 vacuole. Salt or fresh water. 



