98 0. C. Marsh on a new species of Gavial from New Jersey. 
The few portions of the skull preserved are sufficiently char- 
acteristic to show that the animal had an elongated muzzle, and 
that the upper and posterior parts of the head were of the gavial 
type. ee form of the parietal bone indicates, moreover, that 
the temporal apertures were large, and near together, with their 
Suinine sides meer? vertical. The La niertag are —— 
oo strai n the inner side, and their condylar 
faces deeply iff obi sbliguely notched. The pieamatio fora 
on the upper surface of the quadrate near the inner edge, is 
vey large, and see The teeth of this specimen were 
un fortunately not secur 
rtebree are well reserved, and present marked char- 
one, “The articular cup is transversely oval in the cervicals 
and anterior dorsals, and has its upper margin depressed in the 
Ags dorsals. The ho Sees are simple and elongate. 
vom canal of the cervical and anterior dorsal series is 
e, and sub-rectangular in eerrere and the floor unusu- 
a teat and flat. In the posterior dorsals the canal, although 
a ] transverse, becomes less rectangular, with the broader por- am 
tion above. 
The principal dimensions of the tenth, or first dorsal, vertebra 
are as follows :— 
Length of centrum, - - 15° lines. 
Transverse diameter of cup, Sey iS, 2 pte Baie gare 
Vertical diameter of cu ee eee (ee 
Width of Pe canal, in front, mt = 
Height of neural canal, in front, - - #50. * 
The species here described ma — prove to be generi- 
cally identical with the one name writer Thecachampsa 
Squankensis, which is the only Croeodan hitherto found in the 
Eocene of New Jersey. The genus Thecachampsa, however, a8 
proposed by Prof. Cope, easitioe yeh be regarded as a valid one, 
since the concentric structure of the dentine on which it was 
founded,* is not a character of generic importance ; for it occurs — 
in various other Crocodilians, and also in some of the Cetacea. 
the genus Gaviahs, = be called Gavialis mi 
It may readily be distinguished from Thecachampsa 
e from eatly inferior on 2p the ogee amin 
instead of vertical, mn ue y Uy by Senne the b eats ot art sted 
vertebree proportion ngate, and without the 
remarkable saa iiaak is one of the most & 
characters of the latter specie~ 
* Proceedings Philadelphia Acad. Nat. Sciences, 1867, p. 143. 
