262 SOME MINUTE ANIMAL PARASITES 



-ru 



- e. 



a sort of hood (Fig. 49, e\ which is raised for the 

 purpose of absorbing food particles. The cytostome 

 in the free-living forms is beset with cilia along its 

 entire circumference, but some parasitic forms show 



restriction. In Ble- 

 pharocorys, for in- 

 stance, tufts of cilia 

 overhang the mouth, 

 and undoubtedly aid 

 in sweeping food par- 

 ticles into the cyto- 

 pharynx, while an 

 outwardly directed 

 tuft serves to waft 

 waste food particles 

 from the cell anus or 

 cytopyge (Fig. 49, d). 

 j^r^_ . c Blepharocorys is less 



parasitic than certain 

 other Ciliates, for it 

 is able to obtain some 



FIG. 49 -BLEPHAROCORYS, FROM THE of its food by active 

 CAECUM OF A HORSE movements initiated 



a, Macronucleus ; b, micronucleus ; c, by its own cilia, 



contractile vacuole ; d, anus fringed Qbalina CFip- * Q ^ 



with cilia; , hood overhanging the U ? at l V ri &' 537 



mouth, with fringe of cilia;/, mouth; found in the rectum 

 g, gullet with cilia along it; /?, the , M~AA r- ^f +k 



adhesive filament and bladder of the 



frog, has undergone 



further reduction of structure. It can no longer 

 create food currents in a particular direction, and 

 waft nutritive particles towards a specialized region 

 of the body. It possesses cilia, but these are equal 



