272 



BIOLOGY OF THE PROTOZOA 



stages characteristic of the Chrysomonadida and the Cryptomona- 

 dida. 



Reproduction by division occurs either in the motile or resting 

 stages in different cases. Freely moving Gymnodinidse divide in 





Fig. 131. — Types of Dinoflagellida. A, Glenodinium cinctum; B, Ceratiwn fusus; 

 C, Ceratium tripos; D, Gyrodinium sp. 



