MASTIGOPHORA, CHRYSOMONADINA 



207 



gelatinous mass; all individuals connected with one another by 

 gelatinous processes running inward and meeting at a point; with a 

 stigma and a plate-like chromatophore; asexual reproduction of 



Fig. 92. a, Ochromonas mutabilis, X670 (Senn); b, 0. ludihunda, X540 

 (Pascher); c, Uroglena volvox, X430 (Stein); d, Uroglenopsis americana, 

 X470 (Lemmermann) ; e, Cyclonexis annularis, X540 (Stokes); f, Dino- 

 bryon sertularia, X670 (Scherffel) ; g, Hyalohryonramosum, X540 (Lauter- 

 born); h, Stylopyxis nmcicola, X470 (Bolochonzew). 



individuals by longitudinal fission, that of colony by bipartition; 

 cysts spherical with spinous projections, and a long tubular process; 

 fresh water. One species. 



U. volvox E. (Fig. 92, c). Cells 12-20m by 8-13m; colony 40-400/* 

 in diameter; in standing water. 



Genus Uroglenopsis Lemmermann. Similar to Uroglena, but 

 individuals without inner connecting processes. 



U. americana (Calkins) (Fig. 92, d). Each cell with one chro- 

 matophore; 5-8^ long; fiagellum up to 32/i long; colony up to 300^ 



