Fig. 40. 



Euglena viridis ; m, the so-called mouth ; n, the nucleus ; e, the 

 stigma; r, reservoir; c.v., contractile vacuoles ; chr, chromatophors ; 

 am, pyrenoids with sheaths of paramylum. B, another specimen, 

 showing change of shape and diagonal striation of the cuticle. 

 C and Z>, outlines to show various stages of contraction. E, a free 

 swimming specimen undergoing longitudinal division. F and G, 

 division of an encysted form. (A-D, original ; -G, after Stein.) 



