690 ANNA LOWREY 
face of the adjacent plate. The larger of these papillae are 
lobed, always receiving several branches of the main nerve and 
blood vessel. The posterior surface of each plate is rather regu- 
larly and finely convoluted, the convolutions being occasionally 
raised into small papillae. 
Fig. 4 Diagram of an oblique cross-section of an entire filament. A, A’, connec- 
tive sheath; D, D’, papillae on electric surface; H, electrolemma; F, F'’, nuclei on 
nutritive surface; G, G’, nuclei in electric surface; H, middle layer. 
Between each pair of plates is a thin webbing of supporting 
connective tissue which forms a rather distinet partition in the 
dorsal ventral regions, but which is arched forward and usually 
attached to the middle of the posterior surface of the anterior 
plate. This supporting tissue carries the branches of the main 
nerve and blood vessel. 
