of the branches given off from these processes are protoplasmic 
branches, as they have the same appearance and coiirse and actually 
terminate under the external sheath in a way entirely similar to that of 
common protoplasmic processes (as also neuroglia-fibres, vide sequel). 
Could it be possible that these processes are mixed protoplasmic 
nervous processes? GoLGI has described and illustrated nervous 
processes issuing from protoplasmic processes near their origin in 
the cell (vide 1. c. 1885). It may be, that these structures in Myxine 
are processes of a still more mixed nature. More complete observa- 
tions on the course and termination of the main branch of these 
processes are necessary to decide in this question. I can not omit 
to state that it has not been possible to find any otheY processes 
which looked like nervous processes and which issued from the 
same cells as the » mixed processes «, described above. 
The nervous pr 0 c es ses. — My observations on the nervous 
processes are yet very scanty. The chrom.o-silver staining is the 
only one which can tell us anything, with certainty about the 
course of these processes, and upto this time it has been exceedingly 
difficult to get any perfect staining of them. They have a smooth 
and less granular aspect than the protoplasmic process. The slender 
branches have generally at certain intervals varioceles (vide fig. 103, 104). 
From what little I have seen it is probable that in Myxine 
there are also two forms of nervous processes, viz. : 
1) Nervous processes, which do not lose their individuality, as 
they are directly transformed into nerve-tubes; they have, however, 
no isolated course, as they give oft* slender side-branches. Fig. 103, gc, 
represents a ganglion cell with such a nervous process. The process 
has often varicose thickenings at the origin of the side-branches. 
Processes which have no side-branches, but sometimes varicose thicken- 
ings at certain distances, are also seen (vide fig. 94, gc^, gc^), I think, 
however, that the absence oi side-branches issuing from the thicke- 
nings is only owing to imperfect staining. Nervous processes of 
this kind are often seen to pass through one of the commissures 
and over into the other side of the spinal cord (fig. 94). 0 
2) Nervous processes which lose their individuality and are en- 
tirely broken up into slender branches. Fig. 103,^^3 and 104 represent 
ganglion cells with such processes. In their slender parts the branches 
^] In fig. 103,^62 is seen a ganglion cell with a process which crosses the 
commissure and which could be traced for some distance over into the other side; 
this process had the aspect characteristic for protoplasmic processes, but judging 
from its course I think it is a nervous process. At a a branch was given off. 
