INTRODUCTION 



53 



according to the organism in which they are found. Thus the bkie 

 coloring matter sometimes called stentorin, is characteristic of 

 Stentor coeruleus and some species of FoUiculina; a red pigment of 

 Mesodinium rvhrinn; violet of BJepharisma undukms, etc.; the colors 



_e. tT? 





^^ 





% 



I 

 4 





AM. 



^\^ _:.st 



Fig. 21. — Paramecium caudatum. Section of a dividing individual; c. si., con- 

 necting strand of dividing micronuclei; e. tr., extruded trichocj'sts; g. v., gastric 

 vacuole; M, dividing macronucleus; m, m, divided micronuclei; tr., trichocysts. 

 (Original..) 



