384 HANDBOOK OF PROTOZOOLOGY 



Tripalmaria dogieli Gassovsky (Fig. 164, i). In the colon of 

 the horse. About 100 to 200 microns long. 



Genus Tetratoxum Gassovsky. Body oblong slightly com- 

 pressed and medium in size. There are four arched membranes, 

 two being near each end. Slit-like cytostome surrounded by 

 cilia at the anterior end. There are six to eight longitudinal 

 ridges. Macronucleus band-form. A contractile vacuole near 

 the macronucleus. 



Tetratoxum unifasciculatum (Fiorentini) (Fig. 164,7). In the 

 colon of the horse. 



Genus Cochliatoxum Gassovsky. Similar to Tetratoxum; 

 body much larger; two contractile vacuoles. 



Cochliatoxum periachtum Gassovsky (Fig. 164, k). In the 

 colon of the horse. About 400 to 500 microns long. 



Genus Ditoxum Gassovsky. Somewhat similar to Tetra- 

 toxum, but with a single posterior arched membrane. Macro- 

 nucleus elongated. 



Ditoxum funinudeum Gassovsky (Fig. 164, /). In the colon 

 of the horse. Body about 145 to 225 microns long. 



References 



Becker, E. R. and Mary Talbott. 1927 The protozoan 



fauna of the rumen and reticulum of American cattle. 



Iowa State Coll. Jour. Sci., Vol. 1. 

 DoGiEL, V. 1925 Die Geschlechtsprozess bei Infusorien. 



Arch. f. Protistenk., Vol. 50. 

 Gassovsky, G. 1918 Ueber die Mikrofauna des Pferdedarms. 



Trav. Soc. Nat. Petrograd. Vol. 49. 



