tliGH SCHOOL ZOOLOGY. 



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Fig. 19-2.— Types of Flagellate Infusoria. 



1, Monastermo ; 2 Ciliophrys in its two stages; 3, Dinobryon, one of the shells 

 contains an animal which has given rise by biuUiing to a new individual ; 4, Euglena ; 

 5, Anisonenia; 6. Salpingoeca with delicate "collar" standing up round the flagellum ; 

 7, Ceratiuni ; 8, Noctiluoa. 



particles whipjjed into it. A simi)ler method pf obtaining food 

 occurs in Citiophrys, which tlirows out pseudopodia for this 

 purpose, and passes into a flagelhite stage for locomotion. 

 Many of the monads form colonies ; Dinobryon e.g., not only- 

 does so, but possesses another peculiarity which is found in many 

 — the alnlity to secrete a shell. The most interesting forms 

 with regard to the process of nutrition are Euglena and its allies. 

 They are active locomotive forms provided with a mouth, but 

 the latter serves merely to get rid of the contents of the con- 

 tractile vacuole, fluid nourishment being taken up through the 

 cuticular body-wall, as in the lower plants. They further re- 

 semble plants, by possessing coloured bodies which have the same 

 physiological significance as the endochrome of the Algse, i.e., 

 they serve in the presence of light to decompose carbonic acid> 

 so that the animal secures jiait of its carbonaceous food in this 

 way. Various forms like Volvox, usually regarded as plants, 



