41 
to consider. The main part of the parenchyma appears to consist 
of an irregular or wavy fibrous stroma, with protoplasm and scattered 
nuclei, mostly oval. The nuclei are of difierent characters, sometimes 
shewing nuclear figures, at other times devoid of them; sometimes 
jarge and faintly stained, sometimes small and darkly stained. There 
are, however, in some places branched pigment cells which 
appear to communicate together by their processes. The nuclei are 
of very varying size. These segmental bodies having such 
a different structure from the interrenal, are almost 
certainly different both morphologically and physio- 
logically. 
The fibrils which BALrour described in these bodies were prob- 
ably many of them connective tissue, and not nerve-fibrils. I find 
that, apart from definite ganglia, nerve-fibrils are not more abundant 
in these organs than in glandular structures generally (‘interstitial 
plexuses”). In fact, in my opinion, the significance of the re- 
lations of the paired suprarenals to the sympathetic, 
has been much overstated; their relation to the vas- 
cular system is probably much more important. 
8) The suprarenals in the Sturgeon, when treated with osmic 
acid, shewed rounded or elongated oval alveoli marked in bold out- 
lines, and the cell-outlines were admirably preserved. The preponder- 
ating shape of the cells was round or oval, and in some parts the 
cells were seen to overlap, as the section was thick enough to con- 
tain several layers. In other parts the cells were more polyhedral or 
irregular in shape. The protoplasm was finely granular as a rule, 
occasionally more coarsely granular. 
The above is obviously “cortical” structure. I have so far found 
no trace of medulla in the Ganoid organ. There are, however, large 
nerve-ganglia in connection with some of the bodies. There is no 
doubt that the above structure shews these bodies to be the 
true suprarenals of Ganoids. 
The suprarenals of Teleostei likewise consist entirely of cortical 
material. They are surrounded by a fairly thick fibrous capsule, which 
is thicker throughout the area in contact with the kidney. This cap- 
sule sends in trabecule, forming eventually regular alveoli, strikingly 
suggestive of those of secreting glands. These are, as a rule, com- 
pletely filled with cells, but in some species there is a space in the 
centre of each. This space is, however, partially occupied by scattered 
cells, nuclei, and shreds of protoplasm. 
The suprarenal cells are of two kinds. The first are irregular 
