328 
Proceedings of Royal Society of Edinburgh. [may 7, 
separated from the fornix, and at last ran into the anterior and 
lower part of the hippocampal convolution. The lamina cinerea 
was divided superiorly so as to appear like a small ridge running up 
in front of the anterior commissure. The fornix (/) was completely 
divided in the middle line. Its anterior pillars could he traced to the 
corpora albicantia. Each lateral half ran upwards and backwards 
as a sharp well-defined border, and might be traced into the 
descending cornu of the lateral ventricle, where it ended in the 
usual manner. Extending between the anterior part of fornix and 
ridge described above as corpus callosum, was a lamina of white 
matter {spt) of considerable thickness, apparently having no attach- 
ment to corpus striatum, but bounding on the inside the entrance 
to the anterior horn. This was taken to represent one-half of the 
septum lucidum, carried away from the middle line by the divided 
fornix and corpus callosum. The fifth ventricle was thus opened 
up, and communicated (?) with the general ventricular cavity. Into 
this opened fifth ventricle the convolutions immediately above, and 
which formed part of the lateral ventricles, dipped down. The 
anterior and posterior commissures of the third ventricle were pre- 
sent and well-marked.” On the median aspect of the hemisphere 
the gyrus fornicatus absent, only the posterior part of the calloso- 
marginal sulcus {c.m) between the cuneus and prjncuneus present. 
The parieto-occipital {p.o) and calcarine (c) fissures did not meet, but 
reached independently the margin of the ventricle. This anomaly 
is ascribed to the absence of the gyrus fornicatus. (For convolu- 
tions and sulci on outer surface, see original. They presented slight 
abnormalities.) 
IX. Eichler, Arch. f. Psychiatrie^ vol. viii. pt. 2, 1878, p. 355. — 
Labourer, 43, married ; father of well-developed child ; died of 
gangrene of scrotum. Xo mental peculiarity, a diligent, capable work- 
man ; good husband in every respect ; sober, quiet, well behaved ; 
could read and write. Cerebral hemispheres asymmetrical. Brain 
otherwise well developed, richly but irregularly convoluted. Gyrus 
fornicatus absent, or indistinguishable. Calloso-marginal, parieto- 
occipital, and calcarine fissures indistinguishable. Xo corpus 
callosum; in its place a thin transparent membrane, with some 
vessels on its upper surface (the tela choroidea superior?). This 
was probably adherent to falx, and ruptured on removal of the 
