550 PKOTOZOOLOOY 



preoral suture curves to left; niacronucleus round; a micronucleus ; 

 body 100-150m long; in stagnant water and infusion. 



C. (Tillina) camipylum (Stokes) (Fig. 250, i). Ellipsoid to oval; 

 ciliary furrows further apart than the last-named species; preoral 

 suture not curved; 50-120/i long; in fresh and brackish water. 



C. striatum (Stokes). Similar to the last species; contractile 

 vacuole further posterior; 50/i long; in standing water. 



Genus Paraglaucoma Kahl. Somewhat similar to Glaucoma; 

 but without perioral ectoplasmic ridge; a membrane on right 

 ridge of the cytostome; anterior end drawn out to a point in pro- 

 file, posterior end rounded; a stiff posterior bristle; a contractile 

 vacuole; rapid zig-zag movement. One species. 



P. rostrata K. (Fig. 250, j). 60-80ju long; in fresh water (often in 

 dead rotiferan body); California, Wisconsin (Kahl). 



Genus Malacophrys Kahl. EUipsoid or cyhndrical; plastic; cilia 

 uniformly close-set in longitudinal rows ; slit-like cytostome at an- 

 terior extremity; in fresh water. 



M. rotans K. (Fig. 250, k). Oval; close and dense ciliation; 

 spherical niacronucleus central; a micronucleus; a single con- 

 tractile vacuole; body 40-50 ju long; fresh water. 



Genus Espejoia Burger (Balantiophorus Penard). Ellipsoid; an- 

 terior end obliquely truncate; large cytostome at anterior end; 

 postoral groove on ventral side, 1/4-1/3 the body length; a con- 

 spicuous membrane on the left edge of groove; in gelatinous 

 envelope of eggs of insects and molluscs. 



E. musicola (P.) (Fig. 251, a). Elongate; right side fiat, left side 

 convex; 80-100^ long. 



Genus Cryptochilidium Schouteden. Ellipsoid; Avith rounded 

 anterior end, posterior end pointed in profile; highly compressed; 

 uniform and close ciliation; cytostome near middle; one or more 

 longer cilia at posterior end; contractile vacuole posterior; macro- 

 nucleus round; a micronucleus; commensal. 



C. echini Maupas (Fig. 252, b). 70-140)U long; in gut of Echinus 

 lividus. 



Genus Eurychilum Andre. Elongate ellipsoid; anterior end 

 somewhat narrowed; cilia short; dense ciliation not in rows; con- 

 tractile vacuole terminal; niacronucleus band-form; cytostome 

 about 2/5 from anterior end and toward right, with a strong un- 

 dulating membrane on left; no cytopharynx; actively swimming. 

 One species. 



