MORPHOLOGY 



75 



radiate, in which case the number of the canals varies among 

 different species: one in Spirostomum, Stentor, etc., 2 in Clima- 

 costomum, Eschaneustyla, etc., and several in Tillina. In Peritricha, 



Fig. 29. Contractile vacuoles of Paramecium muUimicronucleatum, 

 X1200 (King), a, early systole, side view; b, diastole, front view; c, com- 

 plete systole, front view; d, systole, side view. 



