70 



BIOLOGY OF THE PROTOZOA 



E^ 



.m 0. 



-M 



C. V. 



iv fn 0. 



C 



M 



A- 



-41m 

 mm 



■liSM 



Fig. 30. — Illustrating volume relations of macronuelei and cell body. A, in Spiro- 

 stomum ambiguum; B, in Sjnrosiomum teres; and C, Lionotus procerus; (a), anal pore; 

 (CV.) contractile vacuole; M, macronucleus; (?no.) 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.) 



