86 



BIOLOGY OF THE PROTOZOA 



A 



L -m o. 



--M 



C. V. 



M-— 



! 



Fig 44 —Illustrating volume relations of macronuclei and cell body. A, in Spiro- 

 slomum amUguum; B, in Spirostomum teres; and C, Lionotus procerus; (A) anal pore ; 

 (CV) contractile vacuole; (M) macronucleus ; (mo.) mouth. In Lionotus the mouth 

 is a long slit, in Spirostomum a circular opening at the posterior end of the peristome. 

 (A and B, after Stein; C, original.) 



