CILIATE FIBRILLAR SYSTEMS 233 



fiber (noted above) that connects the basal granules of the dorsal lip. 

 At the anterior, inner end of the pharynx is a large pharyngeal ring 

 fiber that fuses with the inner basket fiber, previously noted, to form 

 the fibrillar bundle. This point of fusion is regarded as comparable to the 

 motorium of C. inytili. From the fibrillar bundle a gullet fiber extends 

 inward and courses throughout the floor of the gullet, finally fraying out 

 at the posterior end. 



The inner basket fiber is united posteriorly with the posterior basket 

 connecting fiber. The latter, bending dorsally and to the right, comes to 

 join the post-oral connecting fiber. Thus a direct connection is made 

 between the peristomal region and the dorsal suture. From this post-oral 

 fiber, numerous cross fibrils connect with adjacent ciliary rows. 



"This neuromotor system is thought to be mainly conductive but some 

 parts of it may possibly be contractile or even supportive." 



Methods 



Fixatives: Klein's (1926), von Gelei-Horvath's (1931), strong Flem- 



ming's for four hours. 

 Stains: Heidenhain's haematoxylin, destained with hydrogen peroxide. 



Dallasia frontata Stokes (Calkins and Bowling, 1929). — The most 

 conspicuous part of the neuromotor system of Dallasia frontata was found 

 to be the complicated apparatus of the mouth. This is composed of a 

 tongue running through the buccal cavity, supported by bars which are 

 anchored in long strands of dense material lying on the floor of the 

 buccal cavity. There are two of these longitudinal strands and two series 

 of bars from the tongue, one on each side. On the right and left sides 

 are undulating membranes. A ladder-like organ originates anteriorly just 

 below the membrane of the buccal cavity and at the right side of the 

 mouth, and runs into the gullet. 



A discoidal mass on the left side of the gullet is interpreted as the 

 motorium. It is connected by fibers directly to the proximal end of the 

 tongue and strands. Similar fibrils connect the outer and the inner margins 

 of the ladder-like structure with the motorium, and these fibers appear to 

 form the outer and inner margins of this organ. Minute granules are 

 present at the ends of each bar, at the points where the bars join with 

 the longitudinal fibers. Posteriorly tivo fine fibers run from the motorium 



