620 



PROTOZOOLOGY 



Genus Pleurocoptes Wallengren. Ovoid, dorsal side hemispher- 

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

 1/3; cyto pharynx indistinct; longer cilia along peristome; macro- 

 nucleus spherical; several micro nuclei; contractile vacuole terminal; 

 ectocommensal. 



P. hydractiniae W. (Fig. 293, e). 60-70)u long; on Hydractinia 

 echinata. 



f ^^^/ d 



Fig. 293. a, Ctedoctema acanthocrypta, X840 (Kahl); b, Calyptotricha 

 pleuronempides, Xl80 (Kalh); c, Histiohalantium nutans, X420 (Kahl); 

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

 (Wallengren); f, Cohnilemhus fusijorrnis, X560 (Kahl); g, C. caeci, X390 

 (Powers); h, Philaster digitifomris, X220 (Kahl); i, P. armata, X240 

 (Kahl); j, Helicostoma buddenbrocki, Xl90 (Kahl). 



Family 4 Cohnilembidae Kahl 



Genus Cohnilembus Kahl {Lemhus Cohn). Slender spindle-form; 

 flexible; peristome from anterior end to the middle of body or longer, 

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

 few longer cilia at posterior end; macro nucleus oval, central; in salt 

 or fresh water, some parasitic. 



