HOLOTRICHA 



515 



Fig. 237. a, Polymorpha ampulla, X1170 (Hsiung); b, Holophry- 

 oides ovalis, X410 (Gassovsky) ; c, Prorodonopsis coli, X700 (Gassov- 

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

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



Genus Blepharozoum Gassovsky. Ellipsoid, with attenuated 

 posterior end; ciliation uniform; cytostome near anterior tip; 



2 contractile vacuoles; macronucleus small, reniform; in caecum 

 of horse. 



B. zonatum G. (Fig. 236, g). 230-245^ by 115-122^. 



Genus Prorodonopsis Gassovsky. Pyriform; ciliation uniform; 



3 contractile vacuoles; macronucleus sausage-shaped; in colon of 

 horse. 



P. coli G. (Fig. 237, c). 55-67^ by 38^5/t. 

 Genus Paraisotrichopsis Gassovsky. Body uniformly ciliated; 

 spiral groove from anterior to posterior end; in caecum of horse. 

 P. composita G. (Fig. 237, d). 43-56M.by 31-40^. 

 Genus Sulcoarcus Hsiung. Ovoid, compressed; a short spiral 



