MONSTROSITIES. 
435 
which form the anterior part of the cranium and the frontal 
sinuses were wanting. The superior orbitary processes had ap¬ 
proximated and united together at their apex, so as to form one 
orbit, in which the eyeball was lodged. On removing a portion 
of these and the parietal bones, a blackish-coloured body was 
seen occupying the situation of the cerebrum, extending from 
the tentorium forward to the orbit, at the place of what appeared 
to be the boundary of the cranium inferiorly. This black body 
had a membrane which covered a small portion of the anterior 
part, and which seemed to form the sclerotic coat of the eye, and 
was continued forward to the cornea. In short, this body was 
the eve, which extended backward into the cranium; the black 
«/ ' 
colour being given by the choroid coat which formed the external 
tunic of the posterior portion of the humour. On removing the 
choroid coat, the expansion of the retina was seen covering the vi¬ 
treous humour, which was of unusually large quantity. The optic 
nerve entered the eye at the under surface in rather a peculiar 
manner, and one which seemed to illustrate the fact how simply 
nature arranges things under peculiar circumstances, in order to 
overcome what to us mortals would appear to be a difficulty; 
at least it would serve to illustrate a theory which we advanced 
in a paper read before the Royal Physical Society some years ago, 
to shew how the inverted image of objects on the retina is 
corrected by the curve which is made by the optic nerves in 
their course between the eyeball and their origin at the corpora 
quadrigemina. In the case before us there was but one optic 
nerve, which took its origin from the only portion of the cere¬ 
brum which was present, and which corresponded with the cor¬ 
pora quadrigemina, and, as in those cases, formed a complete 
semicircle before entering the eye; and the impression of the 
image of objects must, from this cause, be presented in the ida¬ 
tively proper position as it reaches the origin of the nerve at the 
gemim. The whole eye w T as elongated to about tiiple the oidi- 
nary size; the anterior parts were, perhaps, more naturally 
formed than the posterior: the lens seemed to have the ap¬ 
pearance of being double, but from accident was not examined 
with sufficient care. 
