4 
' 
[ram] ON A NEW CROCODILIAN GENUS 281 
Oligocene) of the Mayense basin.! In many particulars there are points 
of resemblance between the Alberta species and C. ebertsi as well as 
Alligator darwin, Ludwig, also from the Upper Oligocene of the 
Mayense basin (Weissenau) (op. cit.) both of which species are referred 
by Lydekker * to the genus Diplocynodon. ‘The same authority regards 
D. ebertsi as identical with D. gracile, Vaillant, already mentioned in 
describing the mandible. The upper surface of the maxillary fragment 
is concave and rises rapidly behind; it is rendered rough by irregular, 
short, longitudinal ridges. A few vascular foramina occur a short 
distance above the alveolar border and smaller ones behind the suture 
for the premaxilla. Beneath, the thin plate-like inward continuation 
of the bone forming part of the palate, is broken away not far from the 
alveoli, exposing the longitudinal excavation for the narial passage, 
Here also are small foramina near the inner alveolar border. The 
three alveoli are placed close together and are of fair size, the first (that 
of the sixth tooth) being the smallest. The palatal part of the bone 
presents a plane surface and there are no pits for the reception of the 
lower teeth, viz. those behind the fourth which are all of small size, at 
least up to the tenth. It is probable that all the lower teeth behind 
the fourth fitted within the upper teeth. The enlarged lower third 
tooth in addition to the fourth probably was received into a notch of 
which only half was contributed to by the maxillary bone. The 
obliquity of the first three alveoli of the mandible is suggestive of an 
interlocking of the anterior lower and upper teeth. Attention may here 
be drawn to the fact that the third and fourth lower teeth of Diplocy- 
nodon ebertsi (Ludwig) are received into a notch in the maxilla behind 
the premaxillo-maxillary suture. From this specimen it is impossible 
to tell how far the nasals extended but judging from the straightness 
of the naso-maxiüllary suture it is probable that they reached a point in 
advance of the maxillaries. 
TEETH. 
The teeth, of. which there are over sixty, found separately, are in 
shape elongato-conical and slightly curved. ‘The crown bears on each 
side a distinct, sharp-edged ridge placed a little toward its inner face 
and extending from the apex to near the base. These ridges define 
laterally an area on the inner surface that is less convex than the outer 
surface and in breadth slightly exceeds one-third of the circumference 
of the tooth. 

1 Paleontographica, supplement, vol. III. pt. IV, 1887. p. 31. pl. III, fig. 5. 
? Catalogue Fossil Reptilia and Amphibia, Brit. Mus., pt. I, 1888, pp. 46 
and 50. ‘ 
Sec. IV , 1907. 14. 
