232 ROYAL SOCIETY OF CANADA . 
The Alberta teeth vary considerably in size. The larger ones are 
broad in proportion to their length; the smaller ones are comparatively 
slender. Most of them show signs of wear and in many, more par- 
ticularly the slender ones, a faint longitudinal fluting is observed 
generally most apparent at the mid-height of the crown on the inner 
face. The majority of them appear to have been shed. The upper 
end of the pulp cavity is indicated by a small excavation in the base 
of the crown. 
In the anterior end of the right ramus, shown in pl. I, fig. 2, 
the base of the fourth tooth is preserved and exceeds in diameter that 
of any of the teeth found separately. Within this base is a succession- 
al tooth (indicated in the figure) that agrees in shape and enamel 
marking with other germ-teeth in the collection. These show the 
lateral keels meeting at the apex and have a lustrous surface caused 
by minute, longitudinal wrinkles in the enamel converging to the point. 
The height of the crown relative to the basal breadth in a few of 
the specimens is given by the following measurements in mm., the 
height being the first of each pair of numbers:—21-10, 20-11, 17-10, 
22-9, 17-8, 15-8, 14-7.5, 13-7, 13.5-5, 11.5-6, 11.5-4.5, 11-4, 10-5, 
8-4, 7-4.5. 
VERTEBRÆ. 
The vertebræ from Alberta are of the proccelian type and resemble 
in general form those of the living Crocodilia. They were found 
separately and are from the cervical, dorsal, sacral and caudal regions. 
They include two second sacrals and a first caudal. 
The largest and most complete specimen is regarded as a late 
dorsal, plate IV, figs. 12, 12a, although, as the bases only of the trans- 
verse processes remain, it is possible that it is one of the lumbar vertebræ. 
The zygapophyses are preserved as well as the neural spine from which 
the tip is broken off. The centrum is well excavated in front and 
is convex behind. Its inferior surface is flat and laterally it is slightly 
pinched beneath the mid-height. It increases in breadih beneath the 
suture for the neural arch which is robust and rises from the dorsal 
surface of the centrum. The neural canal is narrow and high. The 
neural spine and the zygapophyses present no unusual characters and 
resemble somewhat those of a living crocodile. The transverse processes 
are given off well up on the neural arch about on a level with the mid- 
height of the neural canal. The zygapophyses with the bases of the 
transverse processes at a slightly lower level, together form an undu- 
lating platform of considerable extent. 
