230 ROYAL SOCIETY OF CANADA 
sutures.  Laterally the surface slopes evenly upward and outward to 
the orbital emarginations of the upper surface. 
SEPARATE JUGAL. 
The separate left jugal, plate IV, figs. 11 and lla, is roughly 
rhomboidal in lateral outline. It is robust behind where it gives off 
superiorly the process, pb., that contributes with the transpalatine to 
the formation of the postorbital bar. Behind the process the specimen 
remains thick but narrows rapidly for a short distance, beyond which 
in this and in five other jugals of different sizes the part that is applied 
to the quadratojugal is missing, the fracture in each case being a short 
distance behind the postorbital bar. On the inner surface of the 
process and extending downward and forward is the suture the ¢pi., 
for the transpalatine. In advance of the suture the bone is excavated 
and continued forward to a point as a thin plate between the lachrymal 
and the maxilla which it meets in the long sutures, / and mz, defining 
the anterior end of the bone. Between the posterior end of the 
lachrymal suture and the process is the free edge that forms part of 
the outer margin of the orbit. Behind the process the bone aids in 
the enclosure of the lateral temporal fossa. A number of foramina 
occur in the inner surface of the bone as shown in figure 114. The 
convex exterior surface is irregularly and very rugosely sculptured with 
deep pits enclosed by narrow ridges. One of the jugals is larger than 
the figured and most perfect specimen and four are smaller, the least 
being between one-third and one-half the size of the one figured. All 
agree in general proportions and in the style of sculpture. 
ANTERIOR END OF MAXILLA. 
The anterior end of a right maxilla (cat. No. 783, plate III, figs. 
10 and 10a) has preserved in it the alveoli for three teeth behind the 
suture for the premaxilla which is shown in full. This suture, pm., 
is short and runs slightly backward in its inward course, On the 
inner side is a straight suture, n, for the nasal. A prominent feature 
in this specimen is its rapid increase in breadth behind the premaxillary 
suture indicative of a short and broad snout. In advance of the first 
of the three alveoli (viz. those for the sixth, seventh and eighth teeth) 
and between it and the outer end of the suture is a shallow but decided 
notch, m, into which the fourth lower tooth evidently fitted. This 
notch is not so marked as the one figured by Ludwig in connexion with 
his description of Crocodilus ebertsi from the Lower Miocene (Upper 
