66 



ZOOLOGY 



SECT. 



Anterior and posterior ends are always distinguishable, the flagella 

 being directed forwards in swimming, and, as a rule, dorsal and 



3.Asfosiopis 

 2.0ikomonas (?) 



II.Dinobryon 



13. Anhho|)hysa 14.Rhi|>idodendron 



FIG. 47. Various forms of Flacrellata. In 3, flagellate (a) rmd amreboid (b) phases are 

 shown ; in 5, flagellate () and helizoan (I) phases ; in 8 are shown two stages in the in- 

 gestion of a food particle (/.) ; clir. chroruatophores ; c. vac. contractile vacuole ; f. food par- 

 ticle g. gullet; iiu. nucleus ; /. lorica ; p. protoplasm ; per. peristome ; v. i. vacuole of ingestiou. 

 (Mostly from Butschli's Protozoa, after various authors.) 



ventral surfaces can be distinguished by the presence of a mouth 

 or by an additional flagellum on the ventral side. They are, 



