362 Description of the Skull of the 
ferent sizes. The largest, is composed of portions of the temporal, 
parietal, frontal, sphenoidal, and inferior maxillary bones of the 
right side of the cranium. Saving part of the parietal near the an- 
terior superior angle, the fragment is externally encrusted with the 
rough calcareous matter in which it was imbedded; while its inter- 
nal surface being smooth enables us to trace upon it several impor- 
tant distinctive impressions. ‘The temporal portion of this fragment 
is constituted of the whole of the squamous portion, the greater part 
of the petrous, and part also of the mastoid. On the first, appears 
the fossa for accommodating the middle lobe of the brain, marked 
by its convolutions, and the groove of the middle artery of the dura 
mater; on the second, the two surfaces, divided by the tentorial 
ridge, in the anterior of which is the hiatus of Fallopius, and in 
the posterior, the internal meatus, beyond which the bone is ab- 
ruptly destroyed; and on the third, the deep, large fossa of the 
lateral sinus. This portion of the bone also exhibits impressions of 
the convolutions of the brain; on the Jower surface, in like manner 
appears, the jugular fossa. The parietal bone is defective at its su- 
perior posterior part; and the external incrustation is wanting as 
me down as the parietal protuberance. The bony surface is ren- 
dered smooth by the removal of the deposit, exactly where it lies 
in apposition with this surface. Its internal face shows the marks 
of the cerebral convolutions, and the arborescent arrangement of the 
artery before mentioned. The diploic structure and tables of this 
bone are quite manifest at its irregular edges. The remaining frontal 
fragments are, the external angle and a small part of the orbitar plate 
—that part of it which is united to the apophysis of Ingrassias. ‘The 
convoluted phenomena are somewhat apparent here also, and there 
are faint traces even of the coronal suture. The sphenoidal portion 
is apparently constituted of a small part of the greater wing, the 
cerebral surface of which alone is seen in the interstice formed by 
the temporal, frontal, and parietal divisions, composing the middle 
fossa. Towards the under side, imbedded within the calcareous 
crust, are two spots of cancellated appearance, which are probably 
the remains of the pterygoid process, and the alveolar edge of the 
superior maxillary bone which is in immediate contact with it. 
next in size is the occipital portion; the right half, separa- 
ted from the left, by a vertical section passing through the middle 
of the . Itis covered externally with the common crust, but 
is designated interiorly by the crucial ridge, part of the occipital 
