[LAMBE] ON A NEW CROCODILIAN GENUS 221 
5. A post symphysial foramen in the splenial. 
6. Orbits confluent with the lateral temporal fossæ and larger than the 
supratemporal vacuities. 
7. Eustachian canals enclosed. 
8. The snout, as indicated by the anterior end of a maxilla, short and 
broad. 
9. Fourth lower tooth received into a notch in the maxilla. 
10. Pits of the sculptured bones of the head, and of the scutes, deep 
and separated by narrow ridges. 
11. Vertebræ of the proccelian type. 
These characters indicate a form of Eusuchia (procælian type of 
vertebra) with a short snout, that differs entirely from the described 
brevirostrate forms in the entry of the splenial into the formation of 
the symphysis, a character claimed for the longirostrate forms of the 
suborder. A resemblance to Diplocynodon, Pomel, from the Lower 
Tertiaries of Europe is seen in the enlargement of both the third and 
fourth lower teeth (as shown by the alveoli). As a general rule in 
alligators the fourth lower tooth fits into a pit in the upper jaw, and in 
crocodiles into a marginal notch. There are exceptions, however, to 
the rule in each case. In Diplocynodon, a genus generally referred to 
the Alligatoridæ (of Zittel’s classification), the fourth lower tooth may 
be received into either a pit or a notch. In the anterior end of the 
right maxilla from Red Deer river, a decided notch, next to the suture 
for the premaxilla, is preserved. 
The species from Alberta may then be considered as a brevirostrate 
type of Eusuchia with resemblances to Diplocynodon but with a man- 
dibular symphysis though short yet including the splenial as in some 
forms of the Goniopholidæ (Goniopholis, Owen). As it differs from 
any described species the name canadensis is considered appropriate and 
as its characters prohibit its being-assigned to any known genus Leidyo- 
suchus is proposed as a generic term. The writer has pleasure in 
associating the name of the celebrated paleontologist with this genus, 
particularly as Dr. Leidy was the first to record the occurrence of cro- 
codilian remains in the Judith River formation in Montana. 
Leidyosuchus occupies an anomalous position in the proccelian group 
of the Crocodilia. It is apparently a broad-nosed form and its den- 
tition suggests an affinity to Diplocynodon. The entry, however, of 
the splenial into the formation of the symphysis is an unexpected 
character here and one that has been considered, among the Eusuchia, 
as belonging to the longirostrate forms (Tomistoma, Gavialis, etc.) 
