THE BELL-ANIMALCULE. 



173 



mac 



Fig. 90.— a single head of Vorticdla., highly magnified. c.r, contractile axis of the 

 stalk; c, cuticle; c.i\ contractile vacuole; d, disk; fc, ectoplasm; t/j, entoplasm; 

 ep, epistome ; /.i% f ood-vacuole ; m, mouth; »mc, macronucleus ; mic, micronu- 

 cleus ; 0?, oesophagus; p, peristome ; r, vestibule ; ir.r, water-vacuole-s ; x\ point at 

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



