

cv:.-, 





;-*-> 



i. 





c.v.-- 



[s; 



51} 



r.-z.— ;^ 



l.h.s.4 



m 





If 





FIGURE 11 



FIGURE 12 



FIGURES 11, 12^ STEXTOR CAERULEUS ( AFTER JOIIXSOX). 



a.z.,^ adoral zone, b.p., buccal pouch, cv., c.v.,^ contractile vacuole, 

 d.a.z.,^ distal extremity of adoral zone, cx.ji., excretory pore of con- 

 tractile vacuole, f, f, frontal field. 1, 1,^ line of fission, mgn., 

 meganucleus. o. o\ mouth, p, pS peristome band, r.z., r.z.,^ rami- 

 fying zone, ^•el'., velum. 



274 



