EUGLENA 33 



C. General Facts of Importance 



Related Species. Euglena viridis belongs to the protozoan 

 class Mastigophora which, as the name indicates, is characterized 

 by the presence of one or more whip-like, cytoplasmic filaments, the 

 flagella. The Flagellates, as this group is more commonly termed, 

 may be divided into the animal-like forms, such as the Trypano- 

 somes some of which live in the blood of Man, and the plant-like 

 forms, such as Euglena. Three common types of Flagellates are 

 shown on page 35. 



As a group the Mastigophora present several important prob- 

 lems. One of the most interesting of these is the question of the 

 exact relationship of certain species. For example, a genus like 

 Mastigamoeba which has the general structure and appearance 

 of an Amoeba, but possesses a flagellum. There are also many 

 colonial types among the Flagellates, which reach their culmination 

 in Volvox, which is considered in the next chapter. Finally, many 

 examples can be found of Flagellates which parasitize higher 

 animals, including Man. These parasitic species may be divided 

 into the blood dwellers, or Hemoflagellates, and the intestinal 

 dwellers. The most important types are found among the Hemo- 

 flagellates, such as the Trypanosomes, which are the cause of the 

 deadly Sleeping Sickness of the tropics. (W. fs. 29, 30, 224.) 



Finally, it should be noted that the very important blood-dwell- 

 ing Malarial Parasite does not belong to the Mastigophora, but to 

 a separate class, the Sporozoa. (W. f. 223.) 



TEXTBOOK REFERENCES 



Woodruff, pp. 50-53 ; 339-342. 



Curtis and Guthrie, pp. 166-175 ; 190-191. 



Guyer, pp. 128-132; 189-191. 



Hegner, pp. 39-50. 



Newman, pp. 96; 103-104; 400-401. 



Shull, pp. 54-55; 84; 124; 251. 



GENERAL REFERENCES 



Calkins. Biology of the Protozoa (Lea and Febiger). 



Hartog. " Protozoa," in the Cambridge Natural History (Macmillan). 



Kudo. Handbook of Protozoology (Thomas). 



Parker and Haswell. Textbook of Zoology (Macmillan). 



