PRENTISS, (Veurofibrillar Structures. 175 
Fig. rr. An enlarged drawing. of that portion of Figure 10 from which 
the collaterals are given off. 0’, c’, a’, correspond respectively to 4, c, din 
Figure 10. Many of the fibrillae do not enter the cell process; of these, ¢ 
passes directly from one collateral to another. 
Fig. 12. The collateral of a large nerve element which is apparently in 
direct connection with a longitudinal fiber. a, the collateral ; 4, the connect- 
ing fibril; c, its point of union with the fiber d; ¢, the anterior end of the 
longitudinal fiber d. 
Fig. 73. A fibrillar network from the neuropil of the third abdominal 
ganglion; a-f, neurofibrillae which are connected with the network; g, beads 
of perifibrillar substance. 
Fig. rg. One of the smaller ganglion cells of Airvudo (motor type of 
APATHY), showing the inner and outer fibrillar networks, which are put into 
connection by radial fibrillae. 
Fig. 15. A ganglion cell from the last abdominal ganglion of Astacus. 
Only the fibrillae near the periphery of the upper half of the cell are shown. 
