REPORT ON THE SEALS. 99 



Sylvian fossa; it was bounded externally by a short postrhinal fissure (pr), which was not 

 continuous with the splenial fissure, but was prolonged forwards into the S)dvian fissure, 

 and across that fissure into the rhinal fissure which formed the outer boundary of the 

 tuber olfactorium. A slender prolongation of this tuber passed backwards, but concealed 

 within the Sylvian fissure, to become continuous with the uncinate gyrus. The hippo- 

 campal gyrus {he) was prolonged from the uncinate gyrus backwards and upwards, and 

 was marked by shallow depressions due to the pressure of the small arteries which turned 

 round the gyrus to enter the choroid plexus situated in the transverse fissure of the 

 cerebrum. Opposite the splenium it was continued into the callosal gyrus by a slightly 

 constricted part or isthmus. The callosal gyrus (ee) was prolonged forwards, at first hori- 

 zontally, and then bending down in front of the genu it formed the genual part of the 

 callosal gyrus, and reached the end of the mesial longitudinal fissure on the base of the 

 brain in front of the optic commissure. The suprasplenial fissure of Krueg (sps) could 

 scarcely be said to exist in the right hemisphere, but in the left the convolution which 

 intervened between the splenial fissure and the margin of the hemisphere was partially 

 divided by a fissure running horizontally into an upper and a lower tier. This fissure was 

 the suprasplenial ; the convolution between it and the splenial fissure was the supra- 

 splenial convolution {sspc), whilst the convolution between it and the free edge of the 

 mesial longitudinal fissure was that aspect of the sagittal or marginal gyrus which was 

 directed to the mesial surface of the hemisphere. The suprasplenial fissure terminated 

 anteriorly on the dorsum of the brain behind the crucial fissure. The posts2)lenial 

 fissure (psp) of Krueg was not definitely marked, but the surface of the cerebrum, 

 which was situated below the postero-horizontal fissure, was divided by fissures into 

 four slender convolutions running parallel to each other ; below the lowest of these 

 was a fissure which opened into the splenial fissure, and then ran backwards and 

 outwards to the border of the hemisphere. Should this fissure represent the postsplenial 

 fissure, then the slender convolutions might be collectively regarded as representing 

 the splenial convolution. 



I can make no definite statement as to the presence of the Island of Reil, unless 

 the concealed part of the anterior limb of the Sylvian fissure be regarded as repre- 

 senting it. 



The Pineal body or Epiphysis cerebri, after the cerebral hemispheres were separated 

 from each other, was seen to project backwards immediately behind the corpus callosum. 

 It was 17 mm. long, 9 mm. in greatest breadth, and 6 mm. in greatest vertical diameter. 

 In shape it was like a three-sided pyramid with the apex forwards. The inferior surface 

 rested in its anterior half on the corpora quadrigemina, and in its posterior half on the 

 anterior part of the middle lobe of the cerebellum, whilst the two lateral surfaces were in 

 relation with the sides of the two cerebral hemispheres in the limited region in which it 

 lay between them. By its apex it projected forwards to the cleft between the two optic 



