HOLOTRICHA 



549 



Fig. 250. a, Frontonia leucas, XllO (Kahl); b, F. hranchiostomae, 

 X490 (Codreanu); c, Disematostoma butschlii, X340 (Kahl); d, Lem- 

 badion bullinum, X170 (Kahl); e, Glaucoma pyriformis, X380 (Schewi- 

 akoff); f, g, Lambornella stegoniyiae, X340 (Keilin); h, Colpidium col- 

 poda, Xl80 (Kahl); i, C. campylum, X150 (Kahl); j, Paraglaucoma 

 rostrata, X400 (Kahl); k, Malacophrys rotans, X550 (Kahl). 



longitudinal striation; small oral pit in anterior half; macronu- 

 cleus spherical; a mieronucleus; cysts hemispherical; parasitic. 

 One species. 



L. stegomyiae K. (Fig. 250, /, g). 50-70^ long; cysts 30-40/i in 

 diameter; in haemocoele of Stegotnyia scutellaris. 



Genus Colpidium Stein. Elongated; slightly flattened; dorsal 

 surface more convex; cytostome 1/4 from the anterior end on 

 right side; preoral region curved to right; cytostome similar to 

 Glaucoma; longitudinal striation close; macronucleus spherical; a 

 mieronucleus; a single contractile vacuole; fresh or salt water. 



C. {Paramaecium) colpoda (Ehrenberg) {Tillina helia Stokes) 

 (Figs. 10, c; 250, h). Ellipsoid; anterior end bent toward right; 



