( 354 j 
It would lead us too far to go into details about the arrangement 
of the neurofibrillae in all the different types of ganglioncells, and 
besides, that would not be possible without many plates and drawings. 
I will therefore confine myself here to the following statements : 
According to BerHe *) in most of the ganglioncells of the vertebrates 
the neurofibrillae pass through the cellbody without branching or 
breaking up into a network. Only in the spinal-ganglioncells and in 
the cells of the lobus electricus of Torpedo marmorata Berne observed 
networks of the neurofibrillae, and according to this author networks 
possibly occur in the basal part of the cells of PurKinse in the 
cerebellum and in the cells of the cornu Ammonis. 
According to BOCHENEK ®) it is on the other hand probable, that 
in the vertebrate ganglioncells the neurofibrillae form a very fine 
network with small meshes. The very dense reticulum of neurofibrillae, 
he was able to demonstrate in the ganglioncells of Herx, forms 
according to BocHENEK an intermediate stage between the coarse net- 
work in the cells of Hirudines and Lumbricus, and the very fine 
network in the vertebrate ganglioncells. 
In accordance with the statements by these two authors, we should 
expect to find in the ganglioncells of Amphioxus either a dense reticulum 
or a mass of disconnected interwoven very fine threads, passing from 
one process through the cell-body into another process without 
branching. This is not the case. In most of the ganglioncells the 
arrangement and distribution of the neurofibrillae in the ganglioncells 
resembles very much that which is described by Aparny in the 
ganghoneells of Hirudines and Lumbricus. 
Sometimes we find cells as the one shown in fig. 4, where the 
neurofibrillae pass through the cell-body without interruption, but 
this is only to be found in a few cases. 
In the bigger ganglioncells, which are lying in the dorsal part of 
the spinal cord and in the dorsal group of ganglioncells behind the 
brain-ventricle, there is always a network of neurofibrillae branching 
and anastomosing with each other. After having entered the cell in 
most cases the neurofibrillae form a network round the nucleus 
(partially distinguishable in fig. 5). From out this reticulum radial 
fibrillae go through the cell body to the periphery (often branching 
on their way) where they form a second network. With this network 
are connected fibrillae, which pass through one of the processes of 
the cell (out of the cell or into it?) — in short, a distribution of 
1) Arch. f. Mikrosk. Anatomie, Bd. 55. 1900. P. 513. 
2) Le Névraxe. Vol. Ill. Fase. 1, 1901. P. 85. 
