C.V.- 



r.x.- 



mgn. 





-P-P- 





Ihs. 



FIGURE 11 FIGURE 12 



FIGURES 11, 12 STENTOR CAERULEUS (AFTER JOHNSON"). 



a.z., 1 adoral zone, h.p., buccal pouch, c.v., c.v., 1 contractile vacuole. 

 d.a.z., 1 distal extremity of adoral /one. ex.])., excretory pore of con- 

 tractile vacuole. f, f , frontal field. 1, I, 1 line of 'fission, ingn., 

 iiicirnnticleus. o, o 1 , mouth, p, p 1 , pcristomc- liand. r./,., r.z.,' rami- 

 fyinir /one. >'cl'., vchan. 



274 



