3932 
to five, generally four, of the larger plates formed the larger central 
area of the layer and that from eight to twelve of the smaller ones 
were arranged around it and filled in the outline of the layer. Fig. 4 
shows a diagrammatic outline of a single layer of the organ with the 
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Fig. 3. Camera-outline of a larger and more central electroplax of 9 mm length. 
6 region of secondary overlap; other numerals indicate the same as in the preceding 
figures. 
arrangement of its electroplaxes. This diagram omits the incisions as 
well as the overlaps. 
The electroplax is placed in the organ with its electric layer or 
electric surface upward and with the nerve-supply approaching it from 
