Ciliophora 359 



Fig. 7. 16. AC. Transverse sections of Paramecium caudatum, anterior 

 part of oral groove, posterior part of groove, and near the cytostome; x380 

 (after Wetzel). D. Vestibule and cytopharynx of Paramecium bursaria, seen 

 from the right side, showing the dorsal "quadripartite membrane" and the 

 penniculus; vestibular cilia shown only on the outer margin; xlOOO (after 

 V. Gelei). E-L. Various species of Paramecium, showing general form, oral 

 groove, position of cytopharynx, macro- and micronuclei; x500 approx., 

 schematic (after Wenrich): E. P. aurelia Ehrbg.; F. P. bursaria (Ehrbg.) 

 Focke; G. P. calkinsi Woodruff; H. P. caudatum Ehrbg.; I. P. multimicro- 

 nucleatnm Powers and Mitchell; J. P. polycaryum Woodruff and Spencer; K. 

 P. trichium Stokes; L. P. u'oodruffi Wenrich. M. Transverse section through 

 Paramecium caudatum showing trichocysts, somatic cilia, double vestibular 

 cilia, penniculus, quadripartite membrane; pharynx is not ciliated except 

 for the quadripartite membrane; schematic (after v. Gelei). 



