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layer of the layer above or below. Its place in the original layer is 
taken by another electroplax that is separated from it by one of 
the characteristic incisions. In some cases the electroplax seems to 
divide. j 
Turning, for an explanation, to the teased preparation we can 
see that the electroplax bends upon itself so as to overlap upon its 
own body at some points of considerable area, and that the overlap- 
ping portion is the part that must find room in which to secure nerve 
8 
Fig. 2. Camera-outline of a smaller, outer electroplax of 3,6 mm length with a 
Fr 
diagrammatic vertical section (B) taken through the line (©). 3 incisions, 5 overlapping 
portion, 6 line at which the overlapping portion rises into the next layer, 8 outer 
boundry of the layer and also of the organ. 
supply and blood supply for its nourishment and activity. This it 
does by leaving the layer in which it can no longer find place to 
secure these necessities and going into the one above or the one 
below. In many cases the overlapping portion may have an overlap 
itself so that the one and same electroplax is distributed through three 
different layers (Fig. 3, 7). 
The general arrangement of the different electroplaxes in a single 
layer was gotten out with fair accuracy. It was found that from three 
