1 64 



ROBERT W. HEGNER. 



studied were of approximately the same age at the time they were 

 examined they differed greatly in size. Those in the pond without 

 algae being on the average approximately twice as long in both 



FIG. i. A living specimen of a euglenoid of Species A showing characteristic 

 shape, three flagella, reservoir, stigma, chromatophores and nucleus. 



X 1600. 



FIG. 2. Species A as seen when stained with iodine. X 1600. 

 FIG. 3. Species A fixed in Schaudinn's solution and stained with iron-haemotoxylin. 



X 1600. 

 FIG. 4. A living specimen of Species B showing flagellum, reservoir, stigma, and 



chromatophores. X 1600. 

 FIG. 5. A living specimen of Phacus found in the intestine of Rana pipiens 



tadpoles. X 780. 



