THE MASTIGOPHORA 



167 



The inner protoplasm of the cell, which may be referred to as 

 the endosarc, is of a semi-fluid consistency, but sufficiently stiff 

 to hold the various inclusions in place without the obvious flowing 

 that occurs in many other protozoa. The nucleus lies near the 

 center. Embedded in the ajtoplasm are found structures charac- 

 teristic of green plants, the chromatophores, containing chlorophyll, 

 and masses of the carbohydrate paramylum, a substance allied 

 to starch. 



Fig. 91.— Structure and activities of euglena and related flagellates. 



A, typical euglenoid. B, 1-3, euglenoid movements of Astasia. C and C, gullet and 

 stigma or eye-spot of euglena. D, spiral course of swimming euglena. E, inge.stion of 

 bacteria by euglena. F, ingestion of another protozoan by Peranema. G, euglena feeding 

 upon mass of bacteria. H, euglena completing longitudinal fission. 



6. mass of bacteria; c.e.. food; ch, chromatophore; /, fiagellum; /.v.. food vacuole; 

 (7. gullet; n. nucleus; p, paramylum body; r. reservoir surrounded by contractile vacuoles; 

 r.o., pharyngeal rod; s. striation; st, stigma, or eye-spot. (A, after Walton; C, after 

 Wager; E to //, after Tannreuther.) 



Movements, Locomotion, and Behavior. — Expansions and 

 contractions of the cell are frequently observed in euglenas that 



