EUGLENOIDINA 237 



C. ova (Ehrenberg) (Fig. 102, g). 20-40/1 long; in fresh water 

 with Euglena. 



Genus Trachelomonas Ehrenberg. With a lorica which often pos- 

 sesses numerous spinous projections; sometimes yellowish to dark 

 brown; a single flagellum protrudes from anterior aperture, the rim 

 of which is frequently thickened to form a collar; chromatophores 

 either 2 curved plates or numerous discs; paramylon bodies small 

 grains; stigma and pyrenoids; multiplication by longitudinal fis- 

 sion; one daughter individual retains lorica and flagellum, while the 

 other escapes through flagellar aperture, forms a new flagellum and 

 secretes a lorica; cysts common; specific differentiation is based 

 upon the lorica; fresh water. Numerous species. 



T. hispida (Perty) (Figs. 31, a; 102, h). Lorica oval, with numer- 

 ous minute spines; brownish; 8-10 chromatophores; 20-42/z by 

 15-26iu; many varieties. 



T. urceolata Stokes (Fig. 102, i). Lorica vasiform, smooth with a 

 short neck; about 45/x long. 



T. piscatoris (Fisher) (Fig. 102, j). Lorica cylindrical with a short 

 neck and with numerous short, conical spines; 25-40/i long; flagel- 

 lum 1-2 times body length. 



T. verrucosa Stokes (Fig. 102, k). Lorica spherical, with numerous 

 knob-like attachments; no neck; 24-25/i in diameter. 



T. vermiculosa Palmer (Fig. 102, I). Lorica spherical; with many 

 sausage-form markings; 23/i in diameter. 



Genus Cryptoglena Ehrenberg. Body rigid, flattened; 2 band-form 

 chromatophores lateral; a single flagellum; nucleus posterior; 

 among freshwater algae. One species. 



C. pigra E. (Fig, 102, m). Ovoid, pointed posteriorly; flagellum 

 short; stigma prominent; 10-15)U by 6-10/x; 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 flagellum; a stigma; numerous chromatophores discoid; 

 with or without pyrenoids; reproduction as in Trachelomonas 

 fresh water. 



A. vaginicola S. (Fig, 102, n). Lorica about 43;u b}^ 15ju. 



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 flagellum; a single flagellum only in free-swimming stage; 

 discoidal chromatophores numerous; with pyrenoids; multiplication 

 by longitudinal fission; also by swarmers, possessing a flagellum and 

 a stigma; fresh water. Several species. 



