HOLOTRICHA 



591 



short thick cilia throughout; ectoplasm thick; macro nucleus spheri- 

 cal, in anterior 1/6; micronucleus(?); 2 longitudinal grooves, one be- 

 ginning on each side near anterior end, united at the notched pos- 

 terior end; a series of apertures in grooves considered as cytostomes; 

 at posterior 1/3, an aperture gives rise to branching canals running 

 through endoplasm, and is considered as excretory in function; in 

 the colon of Procavia capensis and P. brucei. One species. 



Fig. 280. a, Pycnothrix monocystoides, X50; b, Nicollella denodactyli, 

 X170; c, Collinella gundi, X170 (Chatton and Perard); d, Buxtonella 

 sulcata, X400 (Jameson). 



P. monocystoides S. (Fig. 280, a). 300^-2 mm. long. 



Genus Nicollella Chatton and Perard. Elongate; a narrow groove 

 extends from the anterior end to cytostome, located at the middle of 

 body; bilobed posteriorly; contractile vacuole terminal; macronu- 

 cleus ellipsoid, anterior; a micro nucleus; ectoplasm thick anteriorly; 

 ciliation uniform; in the colon of Ctenodactylus gundi. One species. 



