196 KANSAS UNIVERSITY QUARTERLY. 



The writer has already shown* that the lower jaws do not have 

 the sharply triangidar shape with concave upper surface, as 

 originally described. The buccal surface is flat and limited on 

 either side by a thin narrow parapet of bone. A similar structure 

 apparently obtains in the upper jaws; the roof of the mouth is not 

 arched, but flat, and it does not seem possible that the mouth 

 cavity could have been more than an eighth of an inch in depth in 

 life when closed, necessitating an extremely thin tongue, if it pro- 

 jected at all forward. The conjoined ant-orbital and narial opening 

 is elongate, subtriangular in shape, and with all the sides gently 

 concave. In length it measures 60 mm. with a greatest width of 

 30 mm. a little in front of the glenoid articulation. Its margins are 

 thin and smooth. At the posterior part a thin triangular plate of 

 bone descends to imite with the anterior ramus of the jugal, show- 

 ing a distinct line of union with it, which runs obliquely to below 

 the middle of the anterior margin on the orbits. On its front, 

 concave border, as it overlaps the jugal, may be seen the 

 beginning of a sutural line which probably separates the lacrymal. 

 Projecting from the superior anterior angle of the orbit is a slender 

 process, extending apparently directly outward or at the most with 

 a downward curvature. It has a length of 18 mm. and a width 

 near the extremity of 5 mm. Its posterior border is concave, and 

 forms part of the orbit. If this is the prefrontal extending over 

 the orbit, as in Mosasaitnis horridiis Will., I do not know of what 

 thedescending process connecting the jugal is composed. 



The roof of the orbits is nearly horizontal above, where the least 

 distance between the margins of the two sides is about 25 mm. 

 The orbits are triangular in shape, with the angles rounded. 

 Posteriorly the roof is directed outward and downward with its 

 superior surface sloping into the supratemporal fossa. At its 

 extremity, where it unites with the postfrontal elements, it is 

 narrowed. The distance between this extremity on the two sides 

 measures 60 mm. The anterior and inferior borders of the orbit are 

 thin and sharp. The jugal is broad and smooth below. The 

 anterior ramus has a width of 18 mm, the posterior one at 

 its upper part a width of 7 mm. The squamosal descends down- 

 ward and backward nearly to the head of the quadrate and then 

 turns upward along the occipital margin. Below it there is a 

 thin, flat bone, which arches backward to the head of the quadrate 

 and forward along the under margin of the jugal, and which seems 

 to be the quadratojugal. There is no interval between it and the 



*Kansas University Quarterly IV, (il, plate. 



