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. Cymnodlnium ovum, Schutt. 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 (Butschli) (Fig. 5), which 

 were first seen by O. F. Miiller (1773) and later fairly well described 



