MORPHOLOGY 



65 



long fibers (acf) from the anal cirri which converge and appear to 

 unite with the motorium as a single strand. From the right end of the 

 motorium extends the membranella-fiber anteriorly and then to left 

 along the proximal border of the oral lip and the bases of all mem- 

 branellae. Yocom further noticed that within the lip there is a 



sm 



Fig. 17. Ventral view of Euplotes eurystomus (E. patella) showing neu- 

 romotor system, X670 (Hammond), acf, fibril of anal cirrus; am, anterior 

 adoral zone membranelle; m, motorium; mf, membranelle fibrils; oc, en- 

 doral cilia; pf, post-pharyngeal fibril; pra, post-pharyngeal membrane; 

 rf, radiating fibrils; sm, suboral membranelles; vm, ventral adoral zone 

 membranelles. 



latticework structure whose bases very closely approximate the cyto- 

 stomal fiber. Taylor (1920) recognized two additional groups of 

 fibrils in the same organism: (1) membranella fiber plates, each of 

 which is contiguous with a membranella basal plate, and is attached 

 at one end to the membranella fiber; (2) dissociated fiber plates con- 

 tiguous with the basal plates of the frontal, ventral and marginal 

 cirri, to each of which are attached the dissociated fibers (rf). By 

 means of microdissection needles, Taylor demonstrated that these 



