118 HANDBOOK OF PROTOZOOLOGY 



Asexual reproduction is by longitudinal fission; sexual repro- 

 duction has been reported in Euglena sanguinea. Encystment 

 common. The members of this genus are common in stagnant 

 water, especially where algae occur. When present in large 

 numbers, the active organisms may form a green film on the 

 surface of water and resting or encysted stages may produce 

 conspicuous green spots on the bottom of the pond or pool. 

 Numerous species in fresh water. 



Euglena pisciformis Klebs (Fig. 40, a). Body about 25 to 

 30 microns long by 7 to 10 microns broad. Spindle in form, with 

 bluntly pointed anterior and sharply attenuated posterior end. 

 Highly active. Paramylum indistinct; chromatophores small 

 and discoidal. Flagellum is fairly long. Common. 



Euglena viridis Ehrenberg (Figs. 6; 40, b). Body 50 to 120 

 microns in length. Anterior end rounded, posterior end pointed. 

 Spindle-shaped during motion; highly plastic when stationary. 

 Pellicle smooth and obliquely striated. Chromatophores are 

 more or less band-form and arranged in a stellate form. Nutri- 

 tion is holophytic, but the organism is also able to carry on sap- 

 rozoic nutrition, during which period the chromatophores are 

 said to degenerate. vSolitary and common. 



Euglena acus Ehrenberg (Fig. 40, c). Body 100 to 200 mi- 

 crons long; narrow spindle-form; posterior end sharply pointed. 

 Spiral striation on the pellicle is very delicate. Paramylum 

 bodies are short rod-form. Nucleus central; stigma distinct; 

 flagellum short. Movement sluggish. Solitary. 



Euglena spirogyra Ehrenberg (Fig. 40, d). Body 150 to 

 260 microns long. With spirally arranged striations, consisting 

 of small knobs on the pellicle. Two ovoidal paramylum bodies, 

 one on either side of the nucleus which is located in the ap- 

 proximate center of the body. Movement sluggish. Flagellum 

 short; stigma prominent. Solitary among algae. 



Euglena oxyuris Schmarda (Fig. 40, e). Almost always 

 spirally twisted; pellicle with spirally arranged striations. Two 

 paramylum bodies are ovoid and conspicuously observable on 

 either side of the nucleus. Body large, 250 to 400 microns long. 

 Solitary. 



Euglena sanguinea Ehrenberg (Fig. 40,/). Body about 55 

 to 120 microns long. With haematochrome. Often found in 



