256 Papers from the Department of Marine Biology. 



and chromatin bodies moved by this force against dorsal side of nucleus. Coarse linin 

 reticulum due to cell being situated in interior of specimen. Bouin fixation. 



FIG. 23. A cell from Torpedo marmorata, No. 4, which has been subjected to a centrifugal 

 .-force of 828.5 gravity in the anterior-posterior direction for 30 minutes. Both plasmosome 

 and chromatin bodies have been thrown to the caudal side of the nucleus. Flemming's 

 fixation. The perichromatin has been partly dissolved by the fixative, thus making the 

 chromatin bodies smaller; and the fine linin reticulum indicates that this cell lay very near 

 to the surface of the bit of tissue that was thrown into the fixative. 



PLATE 6. 



FIG. 24. General view, with partial dissection, 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 electric organs is indicated by the plus and minus signs. 



FIG. 26. Transverse section through medulla oblcngata of Torpedo marmorala. The 

 section passes through the thickest part of the electric lobes, whose large motor nerve-cells 

 are seen to compose the greater part of its mass. The nerve processes of these cells are 

 seen to be leaving the lobes laterally as the large electric nerves that go to the electric organ. 

 After Fritsch. 



