20 



THE PROTOZOA 



the majority of Mycetozoa undoubtedly resemble fungi more than they 

 do Protozoa, and will not be further considered in the present work ; 

 the Phytoflagellina have, on the other hand, so many obvious connec- 

 tions with the animal flagellates that they cannot well be omitted. 



Fig. 5. Dinoflagellidia. [SCHUTT.] 

 A. Gymnodinium ovum, Schiitt. B. Peridinium divergens Ehr. f, the transverse furrow. 



The flagellated organisms now included under Diesing's name, 

 Mastigophora, fall naturally into three subclasses : (i) the Flagellidia 

 (Fig. 4) (flagellates in a strict sense), recognized by Dujardin and 



n 



Fig. 6. Coccidiida in epithelial cells. [LABBE.] 



The coccidium, a species of the genus Myxinia, is supposed to have divided in one case (to 

 the right), c, the sporozoon; n, the nucleus of an epithelial cell. 



named by Cohn ('53); (2) Dinoflagellidia (Biitschli) (Fig. 5), which 

 were first seen by O. F. Miiller (1/73) and later fairly well described 



