340 University of California Publications in Zoology [Vol. 20 



Neuromotor Center 



All the fibers of the neuromotor system ramify out from the 

 neuromotor center (fig. A, n.c.) whicK is just anterior to the eyto- 

 stome near the oral surface. In plate 35, figure 22, are seen two 

 bodies to which fibers converge. This figure was drawn from a 



Fig. A. Semi-diagrammatie sketch of Faramaecium caudatum, oral view, 

 showing oral whorl of peripheral fibers and the ciliary lines, ciliary suture, and 

 trichocyst ridges. 



Fig. B. Aboral view of Paramaecium caudatum, showing aboral whorl, 

 ciliary lines, and trichocyst ridges. Abbreviations: c. v., contractile vacuole; 

 c. s., ciliary suture; o.gr., oral groove; mac, macronucleus; c. gr., ciliary 

 grooves; n. c, neuromotor center; or. wh., oral whorl; mic, micronucleus; memb., 

 cytopharynx membranelle; cyt., cytostome; cyp., cytopharynx; t.r., trichocyst 

 ridges; p. fib., peripheral fibers. 



Figures A and B are reprinted by permission of the editor of the American 

 Naturalist from Rees (1921). 



