168 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Dec. 22, 
phite foramina have a squarish outline, and from back to front they 
measure nearly six inches. The temporal arch is proportionately 
long and strong; the occiput is broad and low; the angular crest 
already noticed forms its upper limit; its lower border is thin and 
nearly straight. This and the greater part of the posterior surface 
appear to be formed by an outward extension of the exoccipital to 
the mastoid and quadrate bones. The surface, generally flat, is 
crossed on the level of the foramen magnum by a horizontal ridge, 
which makes an acute angle with the outer end of the occipital 
crest. Between this ridge and the crest the surface is depressed 
and slightly overhung by the latter. Beneath the outer end of the 
ridge is a deep hollow. The foramen magnum is an ellipse; its 
horizontal axis. measures 1:1 inch, and its vertical axis ‘8. 
The occipital condyle is broken off, as is also the articular end of 
the quadrate bone. Of the orbits, only the front and upper part of 
the left one remains; its lateral position gives its opening an out- 
ward direction; its anterior border seems to have scarcely risen 
above the level of the surrounding parts. A furrow probably marks 
off the lachrymal from the preefrontal bone. Between the orbits, 
the broad forehead, now very mutilated by fractures, appears to 
have been gently convex. The sutures are here too indistinct to 
allow me to speak with certainty of the forms and limits of the 
bones composing this region. - 
The snout is shorter than that of the Honfleur Gavial “téte a 
museau plus court.’’ A pair of large triangular bones united by a 
mesial suture 9 inches long, descend from the forehead to the middle 
of the snout, forming a great part of the upper surface in this situa- 
tion. ‘Their posterior limit is not accurately determinable. It ap- 
pears to be invaded by a descending process of the prefrontal. Their 
outer border is conterminous behind with the maxillary bone. In 
front they form conjointly a broad wedge. These bones evidently 
correspond in their position and in their relations to the pair of 
bones lettered a a in the illustrations of the Honfleur Gavials in the 
‘Ossemens Fossiles,’ * which Cuvier called nasals. He refers to them 
in these words :—“ On y voit, en a, les extrémités antérieures des os 
du nez, formant comme dans le Gavial, une pointe précédée par la 
réunion des maxillaires, 6 6, qui continuent le tube des narines en 
ayant jusqu’aux intermaxillaires.”’ 
The same bones are plainly indicated in a cast of a crocodilian 
snout in the Museum of the Royal College of Surgeons, described in 
the catalogue as a cast of the snout of Stencosawrus robustus, pre- 
sented by Dr. Buckland. Dr. Rolleston, in reply to my inquiry, 
informs me that these bones are also shown in a cast of the Honfleur 
(Geneva) Steneosaur in the Oxford Museum‘, and that the rela- 
tions of the bones in the upper surface of a Steneosaurian skull from 
* Cuvier, ‘ Ossemens Foss.’ tome 5, 2° partie, pl. x. figs. 1 & 5, aa, 
tT I suspect that the figure in the Bridgewater Treatise was taken from one 
of these casts; for the drawing contains a long, hard, straight line, which cor- 
responds to a ridge in the cast in the Royal-College-of-Surgeons Museum, 
formed by the plaster getting into a joint of the mould. 
