212 



CILIATE FIBRILLAR SYSTEMS 



mpted at regular intervals by Cytophanes which are relatively much 

 larger than those found in the Spironem. 



It seems to be generally agreed that the stalk of all the vorticellids, 

 both the Contractilia and the Acontractilia, is a direct continuation of the 

 body. Bearing this in mind, we may now briefly review the fibrillar 



pe//. ___ 



i.mc/o. 



Figure 78. Pellicular structure, and branching of longitudinal myonemes in Zootham- 

 nium. (Entz, 1893.) 

 Ion. myo. — longitudinal myoneme pell. — pellicle 



system of the body proper and later note how the parts of this system 

 are related to those in the stalk. 



For convenience in description and with special reference to the genus 

 Vorticella, we may regard the body as divisible into three fairly well- 

 defined regions : ( 1 ) the funnel, lying between the stalk and the ciliary 

 ring; (2) the bell, that part of the body above the ciliary ring; and 

 (3) the disk, which includes the peristomal border, adoral zone, and 

 cytostome. 



The entire body, like the stalk, is covered by a pellicle which, accord- 



