SUBMENTAL FILAMENTS: GYMNOTID EEL 689 
Fig. 3 Portion of an electroplax. Sagittal section; camera lucida. D, papillae 
on electric surface; H, electrolemma; F’, nucleus in nutritive layer; G, nucleus in 
electric surface; H, middle layer; J, nerve fiber. 
In sagittal section of the filament, the plates appear as bars, 
much the shape of capital I, crossing the space enclosed by the 
sheath of connective tissue. From this view the structure of 
the plates can be seen most satisfactorily. Each plate is made 
up of a central broad syncytium with a row of regularly placed 
nuclei along each surface. On the anterior surface of each plate 
there are two or three, sometimes as many as six, fungiform 
papillae which contain a number of nuclei. Most of these papillae 
receive a small blood vessel and nerve fiber from the posterior sur- 
