552 



PROTOZOOLOGY 





Fig. 251. a, Espejoia niusicola, X300 (Penard); b, Cryptochilidium 

 echini, X380 (Powers); c, Eurychilum actiniae, X360 (Andre); 

 d, Monochihimfrontatum, X440 (Schewiakoff) ; e, Dichilum cuneiforme, 

 X700 (Schewiakoff); f, Loxocephalus plagius, X380 (Stokes); g, j5a- 

 lanonema biceps, X600 (Penard); h, Platynematum sociale, X500 

 (Kahl); i, Saprophilus agitatus, X450 (Stokes); j, *S. muscorum, X440 

 (Kahl); k, Cinetochilum margaritaceum, X440 (Kahl). 



Genus Saprophilus Stokes. Ovoid or pyriform; compressed; cy- 

 tostome in anterior 1/4-1/3 near right edge; with 2 outer mem- 

 branes; macronucleus spherical; contractile vacuole posterior; in 

 fresh water. 



S. agitatus S. (Fig. 251, i). Ellipsoid; ends bluntly pointed; com- 

 pressed; plastic; close striation; about 40^ long; in fresh water in 

 decomposing animal matter such as Gammarus. 



S. muscorum Kahl (Fig. 251, j). Cytostome large, with a large 

 membrane; trichocysts; contractile vacuole with a distinct canal; 

 body about 35ju long; in fresh water. 



Genus Cinetochilum Perty. Oval to ellipsoid; highly flattened; 

 cilia on flat ventral surface only; cytostome right of median line 

 in posterior half, with a membrane on both edges, which forms a 

 pocket; oblique non-ciliated postoral field leads to left posterior 



