558 



PROTOZOOLOGY 



Genus Pleurocoptes Wallengren. Ovoid, dorsal side hemispher- 

 ical, ventral side flattened; peristome large, reaching the posterior 

 1/3; cytopharynx indistinct; longer cilia along peristome; macro- 

 nucleus spherical; several micronuclei; contractile vacuole ter- 

 minal; ectocommensal. 



P. hydractiniae W. (Fig. 254, e). 60-70/x long; on Hydractinia 

 echinata. 



Fig. 254. a, Ctedodema acanthocrypta, X840 (Kahl); b, C alyptotricha 

 pleuro7iemoides, XlSO (Kahl);c, Histiobalantiumnatans, X420 (Kahl); 

 d, H. semiselatum, X270 (Noland) ; e, Pleurocoptes hydractiniae, X470 

 (Wallengren); f, Cohnilemhus fusiformis, X560 (Kahl); g, C. caeci, 

 X390 (Powers); h, Philaster digitiformis, X220 (Kahl); i, P. armata, 

 X240 (Kahl); j, Helicostoma biiddenbrocki, Xl90 (Kahl). 



Family 4 Cohnilembidae Kahl 



Genus Cohnilembus Kahl {Lembiis Cohn). Slender spindle- 

 form; flexible; peristome from anterior end to middle of body or 

 longer, curved to right, with 2 membranes on right edge; a caudal 

 seta or a few longer cilia at posterior end; macronucleus oval, near 

 middle; in salt or fresh water, some endozoic. 



