CILIATE FIBRILLAR SYSTEMS 



255 



D. HYPOTRICHA 



Oxytricha (Lund, 1935). — The parts of the neuromotor system of 

 Oxytrkha apparently are confined to the more speciahzed organelles. No 

 fibrils were found in connection with most of the ventral cirri. 



A long membranelle fibril connects the inner ends of the membranelle 

 plate. The frontal membranelles, in addition, have ciliary rootlets which 

 arise only from the most proximal basal granules of each of the three 

 rows. These combine into a stouter fibril for each membranelle, which 

 ends free in the endoplasm. 



Along the ventral margin of the peristome are numerous fibrils (Fig. 

 91). One of these connects the basal granules of the undulating mem- 



memb.r. - 



b.pl.memb..- 

 term. fit. 



ect.f. 



Figure 91. Oxytriclja. Diagram of fibrillar complex of cytostome, ventral view. 

 (Lund, 1935.) 



b. fib. u. memb. — basal fibril of undulating membrane 



b. pi. memb. — basal plate of membranelle d. cy. fib. — dorsal cytostomal fibril 



ect. f.: — ectoplasmic fold memb. r. — membranelle rootlet 



mg. fib. memb. — marginal fibril of membranelles 

 mg. u. memb. — position of marginal undulating membrane 



p. e. fib. — post-esophageal fibril term. fil. — terminal filament 



V. cy. fib. — ventral cytostomal fibril 



