Millimeters 



Figure 257. — Visceral ganglion of C. virginica. Tangential section. Bouin, hematoxylin-eo.sin. 



a 







Microns 



50 



Figure 258. — Nerve cells isolated from the visceral ganglion of 0. eduUs, according to Rawitz (1887). a, b, — unipolar 



cells; c, d, — multipolar cells; c, — bipolar cells. 



THE NERVOUS SYSTEM 



287 



