Jope. } 430 {March 1, 
edge rising forward. It supports a small part of the articular cotylus on 
its inner face. Most of this portion occupies the extremity of the articu- 
lar. The latter sends a stout lamina obliquely upwards and forwards to 
the lower posterior part of the dentary. 
The quadrate bones are of a peculiar form. They exhibit the usual pos- 
terior curviture above, with shallow funnel-like fossa for the tympanic 
cavity. It presents two strong ridges anteriorly, an inner and an outer 
which encloses a deep vertical concavity. The inner exhibits the suture 
with the pterygoid bone, the outer with the zygomatic. The superior 
border of the quadrate within the sqaumosal is massive and not inflated. 
Its surface is thickest where the usual articulation with the opisthotic 
exists. The posterior horizontal is short and deep. The transverse part 
of the bone which supports inferiorly the exterior part of the condyle is 
thin, and disappears above the antero-posterior portion. From its middle 
upwards it supports the zygomatic. The latter has no great extent an- 
teriorly to its malar suture, and its inferior margin arches high above 
the line of the condyles of the quadrate. 
The pterygoid bones are subtriangular in outline, with concave sides, an 
emarginate base, and a very obliquely truncate apex, which articulates 
low down on the quadrate bone. Both margins are thickened and rounded, 
the superior as boundary of the foramen ovale. The posterior margin of 
the plate-like columella overlaps it on the inner side, deeply notching it ; 
on the outer side, the suture is zigzag and transverse. The superior part 
of the bone is produced like a flat rod, and at its end exhibits a squamo- 
sal suture for union with what is in the snapper a postero-inferior rod- 
like prolongation of the columella. No such process of the columella 
appears to exist in this species. The colwmellar plate is half as large as 
the pterygoid, and exhibits the oblique suture in front for the descending 
lamina of the parietal. 
The postfrontal bone of the left side is preserved entire, and the inferior 
portion of that of the right. The inferior margin for the malar is the 
longest and is straight. The orbit is excavated in part from its anterior 
margin, while the supero-posterior is a continuous curve. The inferior 
suture is a groove, whose inner bounding wall is convex, but rises past 
the straight outer to an inner ridge, which probably approaches the ee- 
lopterygoid region. <A large sutural face for the zygomatic exists at the 
tower posterior angle, and an elongate one above for the parietal. The 
inner face is concave, indicating a large temporal fossa as in Sphargis and 
Chelone. 
Two bones of opposite sides of the cranium are either those portions of 
the pterygoids which bound the temporal fossa below in front, or those 
portions of the maxillary bounding the palatine foramen. As the free 
margin is much thickened they are probably the former. Their inner or 
thinner lamina is marked for squamosal suture with other bones, perhaps 
columella and palatine. 
Measurements of Cranium. M. 
Depth premaxillary suture of maxillary. ..............0.06 
Length from do. suture to inner nares................ .068 
ts 
