256 



CILIATE FIBRILLAR SYSTEMS 



brane. Twenty-two originate near the anterior end of this fibril. Their 

 posterior destinations are as follows: ten terminate in ten small granules 

 attached to the marginal fibril in the region of the posterior seven or 

 eight membranelles; six pass along the dorsal wall of the gullet and 

 extend into the endoplasm to a point near the right side of the body; 

 and the other six continue into the gullet to form the ventral post-esopha- 

 geal fibr/ls. These fibrils along the right side of the peristome were ob- 

 served to be lax, apparently nonelastic, and capable of individual move- 

 ment. 



A delicate fibril extends anteriorly from each of the five anal cirri. 

 In the region at the left of the posterior macronucleus they disappear 

 from view. Their position suggests, however, that they may join the 

 other parts of the neuromotor system, in the region of the posterior im- 

 dulating membrane fibril. 



Methods 



Fixatives: Schaudinn's (with 5-percent acetic), Zenker's. 



x...mot. 



Figure 92. Uroleptus halseyi, section through anterior end. (Calkins, 1930.) 

 b. gr. — basal granule c. fib. — coordinating fibrils 



b. pi. — basal plate mot. — motorium 



