382 HANDBOOK OF PROTOZOOLOGY 



Ophryoscolex caudatus Eberlein (Fig. 164, c). In the stomach 

 of cattle. Body about 200 microns in length. 



Genus Entodinium Stein. In the stomach of ruminants. 

 Body ovoid; anterior end with a spiral row of cirri extending 

 through the cytostome into the cytopharynx; posterior end 

 drawn out into one or several processes. Macronucleus rod- 

 shaped, micronucleus small. One contractile vacuole. 



Entodinium caudatum Stein (Fig. 164, d). About 50 to 80 

 microns long. In cattle and sheep. 



Genus Diplodinium Schuberg. In the stomach of ruminants. 

 Body oblong. Cytostome is located near the anterior end at one 

 side and surrounded by a peristome with a spiral row of cirri. 

 Towards the dorsal side, there is another spiral of cirri. The 

 posterior end of the body is with or without prolongations. An 

 elongated macronucleus with a closely associated micronucleus, 

 is situated near the dorsal surface. Two contractile vacuoles; a 

 cytopyge at the posterior end of body. 



Diplodinium bursa Fiorentini (Fig. 164, e). In the stomach 

 of cattle. Body 100 to 150 microns long. 



Genus Spirodinium Fiorentini. Body oblong; with about 

 three turns of a spiral row of cirri. Macronucleus oblong. 



Spirodinium equi Fiorentini (Fig. 164,/). In the caecum of 

 the horse. About 230 microns long. 



Genus Triadinium Fiorentini. Body is rounded at the an- 

 terior end, and pointed at the posterior end. With three rings 

 of cirri, and a caudal tuft of cilia. Macronucleus elongate. 



Triadinium caudatum Fiorentini (Fig. 164, g). In the caecum 

 of the horse. About 130 microns long. 



Genus Cycloposthium Bundle. Body large, barrel-shaped. 

 Cytostome is in the center of a conical elevation at the anterior 

 end, surrounded by a circle of cirri. Near the posterior end 

 there are two groups of long processes. Macronucleus elongate. 

 Several contractile vacuoles in a row along the macronucleus. 



Cycloposthium bipalmatum (Fiorentini) (Fig. 164, h). In the 

 caecum of the horse. About 255 microns long. 



Genus TTipalmaria Gassovsky. Body oblong, similar to 

 Cycloposthium, but three bundles of long processes, two on 

 the sides near the posterior end and one on the dorsal side near 

 the anterior end. Two longitudinal ridges. 



