190 Messrs. Hancock and Embleton on the Anatomy of EKolis. 
dular apparatus. We cannot confidently say that we have traced 
groups of these pedicles ito the nerves that issue from the gan- 
glia, but we have seen what inclines us very strongly to the idea, 
that such is in reality the relation of these two parts of the ner- 
vous system. At Pl. VI. fig. 2, where a nerve } is shown coming 
off from a buccal ganglion a, parallel striz are observed distinctly 
passing towards the nerve from the interior of the ganglion. 
Again, when the connexions of the nerves with the cerebral 
ganglia are examined, parallel striz can be seen continued from 
the commencement of the nerve for some distance into the gan- 
glion, becoming gradually more and more obscured by the vesi- 
cles of the ganglia and then lost altogether ; but from the tough- 
ness of the enveloping membrane—the body of the Nudibranch 
having lain for some time in spirit and water—and the extraor- 
dinary delicacy of the contained parts, we have not been able to 
lay bare, and leave in situ, in one and the same specimen, the 
real connexion which we believe to exist between the nerves and 
the vesicular element of the central ganglia. But we hope that 
further observation will enable us to show that the pedicles of 
the nerve-corpuscles in Holis are continuous with the nerves; 
and if this be so, then that it may be the means of illustrating 
more clearly the connexion that exists in the Vertebrata and in 
Man between the nerves and the white and the gray matter of 
the brain and the rest of the centres of the nervous system. It 
is highly probable, however, that all the cells of the ganglia pos- 
sess a pedicle or stalk in their perfect state, and that the appa- 
rent absence of a pedicle or pedicles in some cells or groups of 
cells may be owing either to the unfavourable aspect under which 
they are presented to the eye—they being so placed that the pe- 
dicle is either very much foreshortened or hidden altogether by 
the cell itself, or else to the pedicle having been broken off du- 
ring the manipulation of the specimen, or again to the magni- 
fying power in some cases not being sufficient to make them 
discernible, or lastly to their imperfect state of development. 
These cells or vesicles of the nervous ganglia of Holis, although 
they show only one cauda or prolongéd pedicle, are doubtless 
analogous to those caudate vesicles or nerve-corpuscles which are 
characteristic of the gray matter of the cerebro-spinal and sym- 
pathetic ganglia of the higher animals. 
The nerves themselves appear to have none of the cells above 
noticed, but to consist of series of parallel granular lines or 
fibrillze, which on tearing the nerve across often remain detached 
from each other, and which are all in their perfect state enveloped 
in a strong common sheath continuous with the membranous — 
capsules of the ganglia. Where a nerve gives off branches, lines 
of granular matter, probably the fibrille just mentioned, are 
