732 



PROTOZOOLOGY 



C. cucullulus (Miiller) (Chilodon steini Blochmann) (Figs. 53; 312, 

 c-e). 19-20 ventral ciliary rows; oral basket with about 12 rods and 

 with 3 preoral membranes; macro nucleus oval, a characteristic con- 

 centric structure; micro nucleus small; body 100-300^ long, most 



■MHC; 



Fig. 312. a, b, Cryptopharynx setigerus, X650 (Kirby); c-e, Chilodonella 

 cucullulus (c, X270 (Stein); d, oral region; e, nucleus (Penard)); f, C. 

 caudata, X1000 (Stokes); g, C. fiuviatilis, X800 (Stokes); h, C. cyprini, 

 X670 (Moroff); i, Allosphaerium palustris, X1000 (Kidder and Sum- 

 mers). 



often 130-150/x long; fresh and brackish water. Conjugation (Ivanic, 

 1933). 



C. caudata (Stokes) (Fig. 312,/). About 42/z long; standing water. 



C. fiuviatilis (S.) (Fig. 312, g). About 50/i long; fresh water. 



C. uncinata (Ehrenberg) (Fig. 96). 50-90/x long; about 11 ventral 



