PLATE 6 



FIG. 25. 



FIG. 24. General view, with partial dissec- 

 tion, of upper surface of Torpedo 

 marmorata. Shows the two lateral 

 electric organs and the brain with 

 its electric lobes lying centrally 

 between the electric organs. 

 After Fritsch. 



FIG. 25. Vertical, transverse section taken 

 through fish seen in fig. 24. Shows 

 the two lateral electric organs 

 with their vertical column of flat 

 disks, the electroplaxes, and the 

 brain, cut in the region of the 

 electric lobes, lying between the 

 electric organs. The polarity of 

 the E. M. F. generated in the 

 electiic organs is indicated by 

 the plus and minus signs. 



FIG. 26. Transverse section through me- 

 dulla oblongata of Torpedo mar- 

 morata. The section passes 

 through the thickest part of the 

 electric lobes, whose large motor 

 nerve-cells are seen to compose 

 the greater pai t of its mass. The 

 nerve processes of these cells are 

 seen to be leaving the lobes later- 

 ally as the large electric nerves 

 that go to the electric organ. 

 After Fritsch. 



FIG. 24. 



FIG. 26. 



