564 



PROTOZOOLOGY 



M. pulex (ClaparMe and Lachmann) (Fig. 268, i-k). Oral ten- 

 tacles with trifurcate tips; body 20-3 l/x long; salt water; Florida. 

 Noland states that the freshwater forms are 21-38^ long. 



Fig. 268. a, Teuthophrijs trisula, X330 (Wenrich), b, Metacystis trun- 

 cata, X270 (Cohn); c, Vasicola ciliata, X250 (Kahl), d, Pelatr actus 

 grandis, Xl70 (Penard); e-g, Didinium nasutuni, Xl70 (Kudo); h, D. 

 balbianii, X290 (Butschli); i-k, Mesodinium pidex (i, X670; j, oral view; 

 k, oral tentacles, X1330) (Noland); 1, m, M. acarus (1, X670; m, oral 

 tentacles, X1330) (Poland); n, Askenasiafaurei, X530 (Faur^-Fremiet); 

 o, Cyclotrichium meunieri, X7S0 (Powers). 



M. acarus Stein (Fig. 268, I, m). Oral tentacles with capitate tip; 

 10-16m long; salt water, Florida (Noland). 



Genus Askenasia Blochmann. Resembles Didinium; ovoid; with 



