393 
above. As an almost necessary consequence the blood supply comes 
in contact with it on its lower surface. This lower or nutritive sur- 
Fig. 4. Diagrammatic outline of the arrangement of the electroplaxes in a single 
layer of the electric organ. The incisions and overlaps are omitted. Numerals indicate 
the same as in the preceding figure. 
it —_ 
Fig. 5. 
face is evaginated into a vast number of papillae that occupy con- 
siderably more than two-thirds of the thickness of the electroplax 
(Fig. 5, 15). 
These papillae are united by webs and strands of the same 
