226 ROYAL SOCIETY OF CANADA 
in their entirety. The sutures are clearly seen and the foramina in the 
occiput are well preserved. The interior of the brain case is exposed 
to view from the front showing the sutures of the parietal, the alis- 
phenoids and the pro-otics. The walls of the brain case, however have 
suffered considerable damage and are broken away in the neighbourhood 
of the internal auditory meatus on both sides. A separate frontal bone 
and separate jugals admit of some idea being formed of the relative 
size of the orbits. 
Viewing the specimen from above (plate III, fig. 9), the bone 
formed of the coalesced parietals occupies the central position with the 
inner halves of the supratemporal vacuities bounding it laterally in 
front.  Posteriorly on either side of the parietal bone is the suture 
for the squamosal both of which bones are unfortunately missing. The 
squamosal with the postfrontal (also lost on both sides) apparently 
completed the margin of the supratemporal vacuity without the inter- 
vention of the frontal. This last bone, judging from a specimen found 
separately, and to be described later, seems to have taken no part in 
the formation of the opening (or at most reached the border only for 
a very short distance), the postfrontal and the parietal nearly, if not 
actually, meeting behind it. In sutural contact with the parietals below 
are the widely extending quadrates. On the lateral anterior edge of 
each of these bones is seen the suture for the quadratojugal, b, plate ITI, 
fig. 9, and on the upper surface the suture for the squamosal, c, plate 
II, fig. 3, and plate ITT, fig. 9. Overlapping the quadrate and joined 
to it in a broad sutural surface behind is the alar extension of the 
exoccipital, imperfect at its lateral extremity in each case. On the 
upper surface of the quadrate between this suture and the inner edge 
of its condyle is the small foramen d, figs. 3 and 9, which connects by 
a canal with the tympanic cavity and also is, in life, in communication 
with the interior of the articular bone of the mandible. 
In a posterior view of the specimen, plate II, fig. 3, the position and 
relative size of the several elements composing the occiput are clearly 
shown as the sutures are well preserved and can be traced without diffi- 
culty. Comparing the occiput with that of Diplocynodon hantoniensis 
(Wood) as described and figured by Owen in his Monograph on the 
Fossil Reptilia of the London Clay! &c., under the name Crocodilus 
hastingsiæ (Eocene of Hampshire), p. 39, plate VI, fig. 2, it is seen 
to be narrower in proportion to its height. The parietal bone appears 
to a slight extent in the occipital aspect of the specimen. Beneath it 
is seen the supraoccipital, of the same breadth above as the parietal 

* Palæontographical Society, London, 1850. 
