612 PROTOZOOLOGY 



angular cytostome one-fourth from anterior end toward right side; 

 a small ectoplasmic flange along right border of cytostome which 

 shows an undulating membrane on right and 3 membranellae on left; 

 rounded macro nucleus; a micro nucleus; a contractile vacuole; fresh 

 or salt water. 



C. colpoda (Ehrenberg) {Tillina helia Stokes) (Figs. 10; 288, g; 

 289, i). Elongate reniform; 90-150^ long; cytsotome about one- 

 tenth the body length ; 55-60 ciliary meridians; preoral suture curved 

 to left; macro nucleus oval, central; a micro nucleus; fresh water. 

 Burbank (1942) recently examined the effect of various food bacteria 

 on the division rate of this ciliate. 



C. campylum (Stokes) (Fig. 289, d). Elongate reniform; 27-30 

 ciliary meridians; preoral suture curved to right; 50-70/ilong; Kidder 

 cultured the organism bacteria-free; in fresh and brackish water. 



C. striatum S. Similar to the last species; contractile vacuole 

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



Genus Lambornella Keilin. Ellipsoid; densely ciliated; close longi- 

 tudinal striation; small oral pit in anterior half; macronucleus 

 spherical; a micro nucleus; cyst hemispherical; parasitic. One spe- 

 cies. 



L. stegomyiae K. (Fig. 288, h, i). 50-70m long; cysts 30-40/i in di- 

 ameter; in the haemocoele of Stegomyia scutellaris. 



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 profile, posterior 

 end rounded; a stiff posterior bristle; a contractile vacuole; rapid 

 zig-zag movement. One species. 



P. rostrata K. (Fig. 288, j). 60-80^ long; in fresh water (often in 

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



Genus Malacophrys Kahl. Ellipsoid or cylindrical; plastic; cilia 

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

 terior extremity; in fresh water. 



M. rotans K. (Fig. 288, k). Oval; close and dense ciliation; spheri- 

 cal macronucleus central; a micro nucleus; a single contractile vacu- 

 ole; body 40-50m long; fresh water. 



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

 terior end obliquely truncate; large cytostome at anterior end; post- 

 oral groove on ventral side, 1/4-1/3 the body length ; a conspicuous 

 membrane on the left edge of groove; in gelatinous envelope of eggs 

 of insects and molluscs. 



E. musicola (P.) (Fig. 290, a). Elongate; right side flat, left side 

 convex; 80-100^ long. 



