578 



PROTOZOOLOGY 



Genus Paraisotrichopsis Gassovsky. Body uniformly ciliated; 

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



P. composita G. (Fig. 275, d). 43-56m by 31-40m. 



Genus Sulcoarcus Hsiung. Ovoid, compressed ; a short spiral groove 

 at anterior end; cytostome at ventral end of the groove; cytopyge 

 terminal; concretion vacuole mid-ventral, contractile vacuole pos- 

 terior to it; cilia on groove, posterior end and mid-ventral region. 



Fig. 275. a, Polyjnorpha 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). 



S. pellucidulus H. (Fig. 275, e). 33-56m by 30-40m; in faeces of 

 mule. 



Genus Alloiozona Hsiung. Cilia in 3 (anterior, equatorial and pos- 

 terior) zones; in the caecum and colon of horse. 



A. trizona H. (Fig. 275,/). 50-90/x by 30-60m. 



Genus AmpuUacuia Hsiung. Flask-shaped; posterior half bearing 

 fine, short cilia; neck with longer cilia; in the caecum of horse. 



A. ampulla (Fiorentini). About llO/i by 40/x. 



