POLYMASTIGINA 



273 



Fig. 127. a, Hexamita inflata, X690 (Klebs); b, c, H. intestinalis, 

 X1600 (Alexeieff); d, H. salmonis, X2100 (Davis); e, H. cryptocerci, 

 X1600 (Cleveland); f-h, Giardia inlestinalis, X1070 (Kofoid and 

 Swezy); i, Treipomonas agilis, X1070 (Klebs); j, T. rotans, X710 

 (Lemmermann); k, Gyromonas amhulans, X530 (Seligo); 1, Trigo- 

 noynonas compressa, X490 (Klebs); m, Urophagus rostratus, X800 

 (Klebs). 



Genus Trepomonas Dujardin. Free-swimming; flattened; more 

 or less rounded; cytosomal grooves on posterior half, one on each 

 side; 8 flagella (one long and 3 short flagella on each side) arise 

 from anterior margin of groove; at anterior end there is a horse- 



