286 FISH. 



EXPLANATION OF PLATE XVI. 



Fig. 54. Transection of myel, the dorsal columns being characterized by the 

 cut ends of coarser fibers. There are also shown a few fibers of the dorsal commis- 

 sure cutting off some of the cells dorsally from the main portion. The ganglion, 

 with its two roots and three nerve trunks, is, likewise, shown. Near the arms. 

 X 65. 



Fig. 55. Transection of myel, showing the course of the cell processes to 

 form the ventral commissure. X 65. 



Fig. 56. To show the appearance of the cells at the margin of the entocinerea; 

 vent region. X 65. 



Fig. 57. To show the arrangement of the spinal nerve-roots and trunks; from 

 the region of the stomach. X 65. 



Fig. 58. Fusiform cell ; from the myel, toward the tail. X 190. 



Fig. 59. Transition cell ; vent region. X 190. 



Fig. 60. Fusiform cell ; vent region. X 190. 



Fig. 61. Fibers from the dorsal column, with their collaterals. X 190. 



Fig. 62. A figure reconstructed from Figs. 38, 54, and 57. 



Fig. 63. Shows the fibers from the dorsal root, some remaining undivided, and 

 others dividing into a cephalic and caudal branch from which are given off collat- 

 erals. A few spinal ganglion-cells are also shown. X 190. 



Fig. 64. Cell from the olfactory region. X 190. 



