EUGLENOIDINA 209 



form chromatophores lateral; a single flagelliim; nucleus pos- 

 terior; among freshwater algae. One species. 



C. pigra E. (Fig. 96, ?n). Ovoid, pointed posteriorly; fiagelUim 

 short; stigma prominent; 10-15/^ by 6-10^; standing water. 



Genus Ascoglena Stein. Encased in a flexible, colorless to 

 brown lorica, attached with its base to foreign object; solitary, 

 without stalk; body ovoidal, plastic; attached to test with its 

 posterior end; a single fiagellum; a stigma; numerous chromato- 

 phores discoid; with or without pyrenoids; reproduction as in 

 Trachelomonas (p. 207); fresh water. 



A. vaginicola S. (Fig. 96, n). Lorica about ^2>^x by 15^. 



Genus Colacium Ehrenberg. Stalked individuals form colony; 

 frequently attached to animals such as copepods, rotifers, etc.; 

 stalk mucilaginous; individual cells pyriform, ellipsoidal or 

 cylindrical; without fiagellum; a single fiagellum only in free- 

 swimming stage; discoidal chromatophores numerous; with 

 pyrenoids; multiplication by longitudinal fission; also by 

 swarmers, possessing a fiagellum and a stigma; fresh water. 

 Several species. 



C. vesiculosum E. (Fig. 96, o). Colony of 2-8 cells; also solitary; 

 20-30/i by 9-18^; attached to freshwater copepods. 



Genus Eutreptia Perty (Eutreptiella Cunha). With 2 flagella 

 at anterior end; pellicle distinctly striated; plastic; spindle- 

 shaped during movement; stigma; numerous discoid chromato- 

 phores; pyrenoids absent; paramylon bodies spherical or sub- 

 cylindrical; multiplication as in Euglena; cyst with a thick 

 stratified wall; fresh or salt water. 



E. viridis P. (Fig. 96, p). 50-70^ by 5-13/x; in fresh water; a 

 variety was reported from brackish water ponds. 



E. marina (da Cunha) (Fig. 96, q). Flagella unequal in length; 

 longer one as long as body, shorter one 1/3; body 40-50At by 

 8-1 0/x; salt water. 



Genus Euglenamorpha Wenrich. Body form and structure 

 similar to those of Euglena, but with 3 flagella; in gut of frog 

 tadpoles. One species. 



E. hegneri W. (Fig. 96, r). 40-50/x long. 



Family 2 Astasiidae Biitschli 



Similar to Euglenidae in body form and general structure, but 

 without chromatophores; body is plastic, although it assumes 



