190 



O. P. Dellinger. 



Euglcna. 

 The flagellum of Eugleiia is composed of four fibrils which extend 

 its entire length. Thev are twisted abont one another in a spiral of 

 two and one-half turns. (Figs. 1, 2 and 3.) This structure (PL II, 

 Figs. 1 and 2) is demonstrated with ease by subjecting a flagellum 

 to slight pressure. The fibers gradually untwist or separate so that 

 each is distinctly seen. They can be traced into the animal, where 

 they branch out into a system of rootlets. (Fig. 3.) These fibers 

 probably explain Fischer's thread-like appendages to his ''Peitschen- 



FiGS. 1 and 2. — The uncoiled fibrils of the flagella of Eugleua. 

 Fig. 3. — Euglena witli the fibrils of the flagellum branching out into a sys- 

 tem of rootlets in the protoplasm of the body. 



Figs. 4 and 5. — Flagella of Chilomonas Paramecium. 



geissel." What he really saw was some of the uncoiled fibers. Al- 

 though I have used his methods, I have been unable to demonstrate 

 any other structure. I am inclined to think that the fine cilia along 

 the flagellum of Euglena veridis, which he describes, were artifacts. 

 Possibly he may have worked with different species. 



Chilomonas Paramecium. 

 This form has two flagella, which are much smaller than the 

 flagellum of Euglena. The structure was therefore more difficult to 

 make out. Under the same treatment, however, they were demon- 



