6oo Joiinial of Comparative Neurology and Psychology. 



28a are shown several cells from the connective tissue beneath 

 the subocular cartilage of the opposite side of the same specimen. 

 The coarse fibers are those of the first ventral spinal nerve nearing 

 their ending in the most anterior portion of the parietal muscle. 

 The cell in the low^er right hand corner is more highly magnified 



me. 



Fig. 26. Motor endings in the ventral wall of the first gill sac of the left side and peripheral gan- 

 glion cells, m.e., motor endings; sym., sympathetic fibers and ganglion cells. Magnification, 75 diameters. 



at h. Many cells are found about the gill sacs, some in the base 

 of the gill filaments (fig. 28^ and fig. 29) and some on the surface 

 of the muscle (fig. 28c). A considerable number of such cells 

 are found in the roof of the mouth cavity beneath the semilunar 

 cartilage, in the connective tissue around the retina especially 



