CILIOPHORA, PROTOCILIATA 



549 



Genus Protoopalina Metcalf. Cylindrical or spindle-shaped, cir- 

 cular in cross-sectic n; 2 nuclei; in the colon cf various species of Am- 

 phibia with one exception. Numerous species. 



P. intestinalis (Stein) (Fig. 263, a-d). About 330m by 68m; in 

 Bombina hombina, and B. pachypa; Europe. 



Fig. 263. a-d, stages in sexual reproduction in Protoopalina intestinalis 

 (Metcalf); e, f, P. saturnalis, X500 (L^ger and Duboscq); g, P. mitotica. 

 X380 (Metcalf). 



P. saturnalis Leger and Duboscq (Fig. 263, e, /). In the marine 

 fish, Box hoops; 100-1 52m by 22-60m. 



P. mitotica (M) (Fig. 263, g). 300m by 37m; in Amhystoma tigrinum. 



