822 Proceedings of Boyal Society of Edinburgh. [mat 7, 
an inch of the parieto-occipital fissure. The convolutions of the 
occipital lobes are unusually large and numerous. In the temporal 
lobe the sulci are normal, and the convolutions t^) well 
developed. 
On the median surface (fig. 2) the calloso-marginal fissure cannot 
he traced. The fissure of Eolando (/.?’.), as already stated, extends 
as a deep vertical cleft almost to the free edge of the grey matter. 
The parieto-occipital (p.o) and calcarine (c) fissures, both of which 
are well marked, do not join each other, but each passes separately 
into the fissura hippocampi. The parieto-occipital fissure is unusually 
far forward, so that on its mesial aspect also the occipital lobe is 
unusually large. 
On this aspect of the frontal lobe are several quite anomalous 
fissures. Their distribution is very accurately represented in the 
drawing (fig. 2). Specially noteworthy are two almost horizontal 
sulci (fh.) joining the anterior upper angle to the triangular area spt. 
These probably represent the anterior end of the embryonic fissura 
hippocampi (fig. 31; cf. also figs. 11, 12, 16, 21). On the parietal 
lobe, between the (anomalous) fissure of Eolando and the parieto- 
occipital fissure (po), are two deep sulci which pass at a distance 
of about J inch from each other from the free lower margin 
of the gyrus fornicatus almost to the vortex. They lie near the 
middle of the lobe, and diverge slightly from each other as they 
pass outwards. In consequence of the absence of the calloso- 
marginal sulcus, and of the peculiar distribution of the other fissures, 
the gyrus fornicatus is apparently gone, and the convolutions on 
this surface have a peculiar radiated arrangement (cf. figs. 12, 16, 
21, and see Case X.). 
The hippocampal (h) and the uncinate (u) gyri are normal. 
The convolutions on the inferior aspect followed the normal 
type. 
On the base of the brain, the vessels, optic nerves (o.n.), chiasma 
(o.c.), and tracts were normal, as were also the corpora albicantia 
(c.m.) and the peduncles. 
On the mesial aspect the following structures were present and 
normal (see fig. 2) : — (1) the anterior (a.c), middle (m.c), and 
posterior commissures (p.c); (2) the optic thalamus and infundi- 
bulum ; (3) the lamina terminalis (l.t). 
