HOLOTRICHA 



719 



Genus Polymorphs Dogiel. Flask-shaped; ciliation on anterior re- 

 gion, a few caudal cilia; macronucleus disc-shaped; contractile vacu- 

 ole terminal ; in the caecum and colon of horse. 



P. ampulla D. (Fig. 308, a). 22-36/* by 13-21 /* (Hsiung, 1930a). 



Genus Holophryoides Gassovsky. Oval, with comparatively large 

 cytostome at anterior end; ciliation uniform; macronucleus small, 



Fig. 308. a, Pohjmorpha ampulla, X1170 (Hsiung); b, Holophryoides 

 ovalis, X410 (Gassovsky); c, Prorodonopsis coli, X700 (Gassovsky); 

 d, Paraisotrichopsis composita, X450 (Hsiung); e, Sulcoarcus pellucidulus, 

 X410 (Hsiung); f, Alloiozona trizona, X450 (Hsiung). 



ellipsoid; contractile vacuole subterminal; in the colon and caecum 

 of horse. 



H. ovalis (Fiorentini) (Fig. 308, 6). 95-140/* by 65-90/*. 



Genus Blepharozoum Gassovsky. Ellipsoid, with attenuated pos- 

 terior end; ciliation uniform; cytostome near anterior tip; 2 con- 

 tractile vacuoles; macronucleus small, reniform; in caecum of horse. 



B. zonatum G. (Fig. 307, g). 230-245/* by 115-122/* (Hsiung, 

 1930a). 



