44 



IDA H. HYDE. 



go to the band of parallel nerve fibers and the nerve ring. 

 These cells are more numerous in the neighborhood of the lat- 

 ter. Studied from the exumbrella side it was seen that the par- 

 allel nerve fibers lay close to the radial muscle fibers, and that 

 besides the bi- and multipolar cells beneath the ectodermal epi- 

 thelium, there were other, smaller, bi- and multipolar cells, situ- 

 ated between the muscle layer and the endodermal epithelium. 



FIG. 3. Schematic view of nerve cells in a piece of the manubrium from its mar- 

 gin in the radial region. 



P, multipolar cells in radial region of manubrium. 

 Q, fibers from multipolar cells at border of manubrium. 

 y?, sensory cells in epithelium of manubrium. 

 V, multipolar cells at the border of manubrium. 



The fibers from these cells seem to go to the genital glands, the 



<r> o *_> 



coelenteric canal and narrow band of muscle fibers beneath the 

 radial coelenteric canal, as well as into the parallel layer of nerve 

 fibers. It may be that these are especially concerned with the 

 digestive and reproductive systems. 



In addition, therefore, to the marginal nerve ring and the radial 

 nervous system, there is the peripheral network of cells and 

 fibers that exist beneath the epithelium of the subumbrella. The 

 cells of this network are triangular and multipolar with sheathed 

 fibers that have slight thickenings at different places in their ex- 

 tent. Some lie close to the radial (Fig. 2, ;//), others to the mar- 

 ginal nerve bands (Fig. I, g). Then, too, in a line midway be- 



