EUGLENOIDIDA, CHLOROMONADIDA 123 



colony; frequently attached to plankton organisms, particularly 

 copepods, rotifers, etc. Stalk is mucilaginous; individual cells 

 pyriform, ellipsoidal or cylindrical. Without flagellum. Dis- 

 coidal chromatophores numerous; with pyrenoids. Multiplica- 

 tion by longitudinal fission ; also by swarmers, possessing a single 

 flagellum and a stigma. Several species. 



Colacium vesiculosum Ehrenberg (Fig. 41, g). Attached to 

 freshwater copepods. Colony of 2 to 8 individuals; also solitary. 

 Body about 30 microns long. 



Genus Eutreptia Perty. With two flagella at the anterior 

 end; pellicle distinctly striated. Body plastic; spindle-shaped 

 during movement. Stigma; numerous discoid chromatophores; 

 pyrenoids absent ; paramylum bodies spherical or subcylindrical. 

 Multiplication as in Euglena. Cyst with a thick stratified wall. 



Eutreptia viridis Perty (Fig. 41, h). About 90 microns long. 

 Fresh or salt water. 



Genus Euglenamorpha Wenrich. Body form and structure 

 similar to those of Euglena, but with three flagella and inhabit- 

 ing the intestine of frog tadpoles. One species. 



Euglenamorpha hegneri Wenrich (Fig. 41, i). Body 40 to 50 

 microns long. 



Family 2 Astasiidae Biitschli 



Similar to Euglenidae in body form and general structure, 

 but without chromatophores. A single flagellum is present. 

 Body is usually plastic, although it assumes an elongated form. 

 There is a cytopharynx and cytostome, the former being as- 

 sociated with the reservoir of the contractile vacuoles. Stigma 

 is absent, except in Astasia ocellata. The flagellum is usually 

 straight and its free end vibrates in a characteristic manner. 

 Asexual reproduction by longitudinal fission. 



Genus Astasia Dujardin. Body metabolic, although usually 

 elongate; stigma absent except in one species. Fresh or salt 

 water. 



Astasia margaritifera Schmarda (Fig. 42, a). Body spindle- 

 form when in motion. Pellicle indistinctly spirally marked. 

 Numerous paramylum bodies small. Body about 60 microns 

 long. 



Genus Urceolus Mereschkowsky ( = Phialonema Stein). 



