BY CHARLES W. DE VIS, B.A. 393 



but four inches in length, and three in breadth, the average 

 thickness of the parietals is nearly three-quarters of an inch, the 

 least thickness of the occipital one quarter — the bevel of the 

 coronal suture is not less than thirteen lines in depth. The sutural 

 edges are strongly serrated by more or less tortuous plate-like 

 processes continuous from edge to edge. 



The brain-cavity gives us the form of the upper third (there or 

 thereabouts) of the brain anteriorly, increasing to its upper half 

 posteriorly. In the cast taken from it the fore edge of the brain 

 is a straight line broken by the indentations between the anterior 

 convolutions. The anterior angles are rounded, behind them the 

 sides of the anterior lobes of the hemispheres bulge out, but, 

 the posterior lobes contracting, the posterior angles are brought 

 square or nearly so with the anterior. The posterior divaricating 

 edges of the hemispheres form with one another an angle of 110°, 

 and those of the cerebellum being parallel with them respectively, 

 the outline of the cerebellum with its investments is apparently 

 rhomboidal. The dura mater is dense over the cerebellum, but 

 over the cerebrum much thinner, allowing the convolutions 

 beneath it to be seen pretty distinctly. The upper surface of the 

 membrane was highly vascular — the inner table of the skull is 

 throughout channelled with minute branching sulci, which on a 

 gutta-percha impression are seen to communicate with the lateral 

 sinuses and other trunks. A rudimentary tentorium is developed 

 on one side only — on the other there is merely a broad shallow 

 groove. The longitudinal sinus and upper limb of the falx are 

 lodged in a deep median sulcus. The convolutions of the brain 

 are symmetrical and consist mainly of three pairs arranged in two 

 lines, diverging from before backward to the Sylvian fissure which 

 is but faintly marked. The vermiform process is of moderate 

 size — its summit attains nearly the level of the cerebrum; the 

 lateral lobes are about equal to it in breadth. The cerebellum in 

 its fore and aft dimension is to the cerebrum, as seen in the cast of 

 the brain cavity, as five to seven, but the posterior angles of the 

 latter come well back upon the cerebellum and permit no lateral 

 fissure nor depression between them to be seen. 



