.t STCDV or MIXED I'lxOTo'/j ).\ \ cri/ICh'ES 71 



(1. liotly cluiiKiilc; inoiitli .-il luisc uf a hirin, very flcxihli- 



|>n)lK)sc'i.s Dileplug 



CI(!. Kody fliittcncd, Icafliko; prolmsriH only slightly 



(Icvi'lojH'd l.iixnphyUuvi 



VV. W'itliout proboscis. 



G. Mouth anterior to niidcilo. 



H. Form ellipsoidal; mouth not fur from anterior ctid; 

 genus includes some of tlie largest holotrichs 



Frontoiiin 

 II II. Body somewhat kidney shaped; mouth about one- 

 third of the distance hack of tlie anterior end; species 

 small as compared with those of Frontonia . .Colpwla 

 GO. Mouth near middle; gullet short; peristome oblique 



Parnmecium 



