238 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, $2 
of the head and continues downward in a diagonal direction to the 
inner side of the distal end. On the inner side a thin winglike proc- 
ess extends forward and inward from the main mass of the bone. 
The anterior face of the quadrate presents a shallowly concave front. 
The distal articular end is concave transversely and strongly convex 
anteroposteriorly, with a prominent downward projection of the inner 
border. 
Occiput.—The occipital region of the type skull is practically com- 
plete, but two wide cracks passing horizontally through the back 
separate some of the bones, and this fact has necessitated some ad- 
justments in drawing the reconstruction shown in figure 18. The 
sutures of the occipital region are all coalesced and can no longer be 
traced. The supraoccipital (so) is stout and has a sharp median 
ridge extending downward from the top to the foramen magnum. 
The exoccipitals (evo) form the lateral boundaries of the foramen. 
As shown by specimen U.S.N.M. No. 15568, where the excccipitals are 
detached from the basioccipital, they participate in the formation of 
the occipital condyle (occ) (see fig. 18). The condyle is reniform 
and of relatively small size. The paraoccipital processes extend out- 
ward and backward, terminating in expanded ends that are in con- 
tact with the tabulare (fa), squamosal (sq), and quadrate (qu). 
Palate —tThe palate of the type skull, U.S.N.M. No. 15477, although 
distorted by the lateral crushing of the cranium, displays most of its 
important features. It has been skillfully reconstructed by Mr. Pren- 
tice in figure 19 and, while errors of detail may eventually be shown, 
it is believed the more important structures are correctly interpreted. 
The basioccipital and basisphenoid are fully coossified, no trace re- 
maining of their sutural junction. The basioccipital processes (bsp7r) 
are stout rounded projections that extend downward and slightly out- 
ward, with rounded obtuse distal terminations. The basisphenoid 
(dsp) at its anterior external angles develops a pair of strong divergent 
processes, the dilated extremities of which articulate with longitu- 
dinally elongated facets on the medial sides of the pterygoids. The 
pterygoids (pt), widely divergent posteriorly, are in contact with 
the quadrates. On their inner sides, slightly posterior to their mid- 
length, they are in articulation with the basisphenoid processes. The 
slender, posterior, barlike portions of the pterygoids have their great- 
est diameters nearly vertical, and it is assumed they were longitu- 
dinally hollowed out, as in Zguana. Forward of the contact with the 
basisphenoid processes the pterygoids widen transversely, their wid- 
ened anterior ends articulating with the palatines (pal). There are 
no teeth on the pterygoid bones, but at about midlength the palatal 
surfaces are traversed transversely by a low, sharp ridge that extends 
across nearly the whole width of the bone. Opposite the ridge the 
