THE BELL-ANIMALCULE. 



173 



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 m^:* 4 m^ -<'^ ^^:m 



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FIG. 90. A single head of Vorticella, highly magnified. c.r, contractile axis of the 

 stalk ; c, cuticle ; c.r, contractile vacuole ; d, disk ; cc, ectoplasm ; c?, entoplasm ; 

 ep, epistome ; f.r, food-vacuole ; m, mouth; mac, macronucleus ; m/c, micronu- 

 cleus ; o?, oesophagus ; p, peristome ; i\ vestibule ; u\r, water-vacuoles ; .r, point at 

 which epistome and peristome meet at one end of the vestibule. 



