G20 



PROTOZOOLOGY 



0. stcnustonia S. (Fig. 280, I). When extended uj) to 125/x long; 

 attached to Asellits aqnaticus and others. 



Fig. 280. a, Glossatella tinlinnahulum, X610 (Penard); b, Ellohi- 

 ophrya donacis, X900 (Chatton and Lwoff); c, Epistylis plicatilis, 

 X200 (Stein) ; d, E.fugitans, X260 (Kellicott); e, f, E. cambri (e, Xl40; 

 f, X340) (Kellicott); g, Rhabdostyla vernalis, X320 (Stokes); h, Opis- 

 thostyla annulata, X440 (Stokes); i, Campanella umhellaria, XlSO 

 (Schroder); j, Pyxidhim vernale, X240 (Stokes); k, P. urceolatum, 

 Xl40 (Stokes); 1, Opercularia stenostoma, X140 (D'Udekem); m, n, 0. 

 plicatilis (m, X40; n, X60) (Stokes). 



0. plicatilis Stokes (Fig. 280, m, n). About 254/x long; colony 

 1.25-2.5 mm, high; pond water. 



