POLYMASTIGINA 



301 



H. hatrachorum Alexeieff (Fig. 138, j). Oval or spindle form;8-14ju 

 by 4-8 ju; flagella about body length; in gut of Triton taeniatus. 



Genus Protrichomonas Alexeieff. 3 anterior flagella of equal 

 length, arising from a blepharoplast located at anterior end; para- 

 sitic. 



P. legeri A. (Fig. 138, k). In oesophagus of the marine fish. Box 

 hoops. 



Fig. 139. a, motile form with rostellum of Oxymonas dimorpha, X900 

 (Connell); b, attached and aflagellated form of Oxymonas dimorpha, 

 X460 (Connell); c, Proboscidiella kofoidi, X600 (Kirby). 



Genus Monocercomonas Grassi. Small; 4 flagella inserted in pairs 

 in 2 places; 2 directed anteriorly and the other 2, posteriorly; axo- 

 style filamentous; parasitic. 



M. hufonis Dobell (Fig. 138, I). Spindle-form; 12-15/x long; cysts 

 spherical; in Axolotl, Triton, frogs and toads. 



Family 7 Oxymonadidae Kirby 



Genus Oxymonas Janicki. Attached phase with a conspicuous 

 rostellum, the anterior end of which forms a sucking-cup for attach- 

 ment; pyriform. In motile phase, rostellum is less conspicuous; 2 



