E U CI LI A TA , HOW T RICH ID A 



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Genus Perezella Cepede. Body ovoid, the ventral surface 

 is concave and serves as a sucker. Macronucleus ellipsoidal; a 

 contractile vacuole at the posterior end. 



Perezella pelagica Cepede (Fig. 147, e). A coelomic parasite 

 of copepods (Clausia, Acartia, and Paracalanus). 



Fig. 147 a. Intoshellina maupasi. X280 (After Cepede). 



b. Haptophrya michiganensis. X34 (After Woodhead). 



c. Sieholdiellina planariarum. X about 100 (After Cepede). 



d. Lachmannella recurva. X95 (After Cepede). 



e. Perezella pelagica. X340 (After Cepede). 



f. Collinia circulans. (After Balbiani). 



g, h. Protophrya ovicola. (From Cepede). h., Sl young Liltorina 

 rudis with P. ovicola. X80. 

 i. Orchitophrya stellarum. X865 (After Cepede). 

 j. Monomastix ciliatus. X665 (After Roux). 



