216 MEMOIRS OF THE CARNEGIE MUSEUM 
height. It extends for nearly half its height above the occipital condyles, so that 
the latter are far apart superiorly, but approach each other and are nearly or 
quite confluent below on the lower portion of the skull; thus, apparently indicat- 
ing an angular position of the skull with reference to the cervicals. Above the 
foramen magnum, on the median line of the skull, a median ridge — the culmi- 
nation of a median convexity— ascends to the crest of the occiput. Between this 
median convexity and the foramen magnum on the inside, and the lambdoid ridges 
on the outside, is a somewhat uneven depression. The lambdoid ridges are some- 
what oblique, the lower portions being a little in advance of the foramen magnum. 
The posterior lower portions of the squamosal form a plate or long process outside 
of the periotic bones, both of which are preserved in the specimen. ‘There are, in 
the collection, two skulls, which have the posterior lower portion well preserved. No 
tympanic bulle are present but the form of the skull here makes it reasonably 
certain, I think, that the animal had large auditory bulle. They may have been 
cartilaginous, or ossified but very thin, and have separated from the skull before its 
inhumation. The lower surface of the basioccipital is broadly convex just in front 
of the occipital condyles, and narrows anteriorly. This continues in a still narrow- 
ing convexity on the basisphenoid, and as a small narrow ridge on the presphenoid. 
The post-glenoid processes are rather long, projecting some distance below the zygzo- 
matic arches and curving forward. ‘The glenoid surface is triangular and slightly 
convex. The pterygoids have, at the posterior portion, two small triangular wing- 
like processes which are directed outward. The opening of the posterior nares is 
in a plane with the last molars. The palate ends on the median posterior border in 
a point or lobe. The border on each side of this is symmetrically rounded. There 
are foramina in the palatines just posterior and internal to the last molar. The 
anterior portion of the maxillo-palatine foramen is between the fourth premolars. 
The palate is slightly arched in the type specimen. The anterior part of the snout 
is broken off, but the first premolar tooth is present on one side. 
The face is concave in front of and below the orbit, the depression invading the 
anterior portion of the zygomatic arch. In front of this the muzzle is nearly semi- 
circular in section, and it tapers gradually forward. ‘The nasals are long and narrow. 
They have a short contact with the frontals. The zygomatic arches are broad and are 
about equally made up of the malar and squamosal portions; though the former is 
a little broader vertically, than the latter. The posterior process of the malar 
extends to the glenoid surface. The lachrymals appear nearly circular as seen from 
the side. They are small and appear as a little narrow crescent outside the orbit. 
The fronto-maxillary sutures extend obliquely upward and forward from the orbit. 
