LOCOMOTOR AND PREHENSILE ORGANS 



33 



the capture of food. A cytostome, when present, is always near the point 

 of origin of the flagella, one of which may be specially modified in con- 

 nection with the cytostome. Thus, in Chilomastix one flagellum is 

 permanently within the cytostomal groove, where it functions by creating 

 currents which assist in the capture of food (Fig. 69). The thicker of the 

 two flagella possessed by Emhadomonas has a similar function (Fig. 11). 

 As already remarked, in typical flagellates the flagella are few in 

 number, but there occur certain forms which possess many flagella. 



Fig. 



12. — Parajcenia grassii ( x 1,500). 

 (After Janicki, 1915.) 



Fig. 13. — Holomastigoldes hertwigi 



( X 320). (After Hartmann, 

 1910.) 



These are the Hypermastigida, which occur chiefly as intestinal parasites 

 of white ants (Figs. 12 and 13), They stand in this respect as a connecting 

 link between the Mastigophora and the Ciliophora, with both of which 

 groups observers have classed them. Though the possession of flagella is a 

 characteristic feature of the Mastigophora, it must be remembered that 

 these organs of locomotion are not peculiar to this group. Certain forms 

 which are classed with the Rhizopoda, and which are amoeboid organisms, 

 may have flagella at certain stages of development. Similarly, amongst 

 the Sporozoa the microgametes are commonly supplied with one or two 

 I. 3 



