570 



PROTOZOOLOGY 



end, surrounded by protrusible rods; on one side there is a lip-like 

 ectoplasmic projection; fresh or salt water. 



C. (Prorodon) utahensis (Pack) (Fig. 271, h). Body ellipsoid, some- 

 what asymmetrical; comparatively small number of furrows; cilia- 

 tion uniform; a finger-like process in front of cytostome; macro- 



FiG. 271. a, Holophrya simplex, X800 (Roux); b, Lagynophrya mutans, 

 X380 (Kahl); c, Spasniostoma viride, X330 (Kahl); d, Urotricha agilis, 

 X530 (Stokes); e, U. farcta, X470 (Lieberkuhn); f, g, Plagiocampa 

 marina (f, X400; g, anterior end, X670) (Noland); h, Chilophrya utahen- 

 sis, X840 (Pack); i, C. labiata, X500 (Edmondson); j, Platyophrya lata, 

 X280 (Kahl); k, Stephanopogon colpoda, non-ciliated side, X500 (Kahl); 

 1, Prorodon discolor, x330 (Biitschli); m, Pseudoprorodon farctus, X270 

 (Roux); n, o, Placus socialis (o, anterior end view), X530 (Noland). 



nucleus small, central; contractile vacuole terminal; endoplasm 

 with zoochlorellae; encystment common; cysts highly sensitive to 

 light; 50m long; Great Salt Lake, Utah (Pack). 



