— 212 — 
Fig. loi. (Magnified 620 diameters; Zeiss. F, i.) Part of a trans - 
verse section through the white substance (of the ventral 
side of the spinal cord. The neuroglia fibres (/) running 
transversally between the transsected nerve-tubes are 
here very distinctly visible, a External layer where these 
iinite with the sheath (j9?m), enveloping the spinal cord. 
Int Transsected large nerve tubes, where the contents (c) 
has skrunk into one side and is deeple stained. c' Contents 
(skrunk in the same way) of the small longitudinal nerve- 
tubes. nf Slender nerve-tubes running in the external 
layers of the white substance. (Hardened in alcohol, 
stained according to Heidenhains's hæmotoxylin method). 
Plate XL 
The illustrations of this plate (exept fig. 109 & 113) are tåken 
from chromo-silver stained sections of the spinal cord of Myxlne 
ghitinosa. They are drawn under the camera lucida. 
Fig. 102. (Magnified 154 diameters; Zeiss CC, i.) Part of a trans- 
verse section through the spinal cord of Myxine. gc Gang- 
lion cell. mpr Mixed process. 'br-^, ferg, 6^3 ,l)r^ Branches 
given off from this process. pr Protoplasmic Q) process, 
which, however, seem to return into the white substance. 
mpr^ Mixed process of a cell which is not seen in the 
section. ppr^ Protoplasmic process of a cell which is not 
seen in the section. nf, nf\ nf^^ Nerve-tubes or fibrillæ, 
running transversally, in various directions in the grey 
and white substance. vnr Ventral nerve-root. v Vacuole, 
possibly transsected nerve-tube. pec Epithelial cell with 
process, stained for considerable distance through the 
grey tubstance. grs Border of the grey substance. 
» 103. (Magnified 150 diameters; Zeiss CC, i.) Part of a 
transverse section through the spinal cord of Myxine. 
^^1, gc^, gc^ Ganglion cells. np Nervous processes. ppr Pro- 
toplasmic processes. a Place where a branch is given off 
from the nervous process np' . nuCi,nuc2 Neuroglia cells. 
nf, nf , nf^^ Nerve-tubes. ec Epethelial cells surrounding 
the central canal. grs Border of the grey substance. 
dnr Dorsal nerve-root. 
104. (Magnified 200 diameters). Ganglion cell, from a trans- 
verse section of the spinal cord of Myxine. sli Sheath 
