E U CILIA TA , IIOLO TRICHIDA 



367 



Macronucleus ovoid; contractile vacuole near the posterior end. 

 Fresh or salt water. 



Pleuronema chrysalis Ehrenberg (Fig. 158, a). Body about 

 50 to 70 microns long. In fresh or salt water. 



Genus Cyclidium Ehrenberg. Body small ovoid, slightly 

 compressed. Cytostome ventral; peristome narrow, with a con- 

 spicuous membrane. One caudal filament. Fresh or salt water. 



Cyclidium glaucoma Ehrenberg (Fig. 158, b). Body about 

 20 to 30 microns long. Fresh water. 



Fig. 158 a. Pleuronema chrysalis. X400 (After Calkins). 



b. Cyclidium glaucoma. X500 (After SchewiakofT). 



c. Lembadion bullinum. X 150 (After SchewiakofT). 



d. Lembus pusillus. X550 (After Calkins). 



e. L. infusionum. X550 (After Calkins). 



f. Pleurocoptes hydractiniae. X350 (After Wallgren). 

 g, h. Calyptotricha inhaesa. (After Kellicott). 



g, lorica (XlOO); h, the body (X250). 



Genus Lembadion Perty. Body medium large; form con- 

 stant. Oval, slightly flattened dorso-ventrally. Peristome very 

 large and with a large membrane. Cytostome at the end of the 

 peristome. Macronucleus reniform near the posterior end where 

 several long and firm cilia are located. A single contractile 

 vacuole towards the right side near the middle. Fresh water. 



