﻿112 DK. A. SMITH W00DWAED ON [May I9IO, 



but is also evidently deeper than wide ; the antorbital vacuity (A.) 

 is especially large, as wide as the other two together, and distinctly 

 wider than deep ; while the narial opening (N.) is elongate-oval 

 in shape, three times as wide as deep, with its long axis inclined 

 downwards and forwards. As shown by the position of the over- 

 lying quadrato-jugal (qj.), the quadrate bone is nearly vertical, not 

 inclined backwards ; and the lower temporal arcade is slightly bent 

 downwards from the hinder end of the maxilla, as if the axis of the 

 facial region were inclined a little to that of the cranium. The 

 jugal bone (j.) clearly rises into the postorbital bar, seems to be 

 truncated in front where it meets the maxilla in a jagged suture 

 below the lachrymal, and is excluded by the latter element from 

 the margin of the antorbital vacuity. The lachrymal (Z.) forms 

 the lower part of the antorbital bar, and tapers above, where it 

 must have articulated originally with the prefrontal. The maxilla 

 (mat.) is a relatively large triangular bone, excavated in its hinder 

 half by the antorbital vacuity, beneath which it remains as a narrow 

 bar. Its anterior ascending portion is truncated where it reaches 

 the cranial roof, and its straight anterior border forms the lower 

 margin of the narial opening. The outer face immediately in front 

 of the antorbital vacuity is impressed by an extensive fossa ; and 

 in the middle of this is a small deeper depression (x) which may 

 even be another vacuity. The oral margin of the bone is straight, 

 .-and bears sockets for eighteen teeth ; while above this margin there 

 ^occurs the usual series of nervous or nutritive foramina. The pre- 

 i maxilla (pmoc.) is distinctly separated from the maxilla by a suture, 

 Nwhich is vertical below, but curves gently backwards above ; it is 

 ;.also separated with equal distinctness from its fellow of the opposite 

 -side. This bone is about as deep as wide, vertically truncated in 

 lfront, and with a straight oral margin, which bears sockets for four 

 small teeth. Its antero-superior angle is produced upwards and 

 backwards to form a narrow bar, separating the right and left 

 inarial openings in their front half, and then uniting in an extended 

 suture with the attenuated end of the nasals (n«.), which continue 

 ithe bar between the hinder half of the same openings. The nasal 

 Ibar is of extreme interest, as bearing a laterally-compressed bony 

 -excrescence (7*.), of which only an anterior basal fragment remains 

 in the fossil. This excrescence has a roughened surface with 

 indications of vertical grooves, and may be appropriately described 

 as a horn -core. It obviously corresponds with the nasal horn- 

 core already discovered by Marsh in Ceratosaurus nasicornis, from 

 the Upper Jurassic of Colorado. 1 



A narrow, longitudinally-extended plate of bone appears within 

 the antorbital vacuity, and evidently represents a fragment of the 

 palate crushed upwards. It is suggestive of a pterygoid element 

 (pi.), and from its hinder portion there projects downwards and 

 •outwards another small bar of bone, which may perhaps be ecto- 

 pterygoid (eept.). 



1 Am. Journ. Sci. ser. 3, vol. xxvii (1884) p. 330 & pi. viii. 



