UNDETERMINED CROCODILES. i7 
Delaware, presented to the Academy by 'T. A. Conrad, is represented in Fig. 7, 
Plate I. It belonged to a young animal, and has lost its arch at the sutural con- 
junction. It measures fifteen lines long, and is provided with very robust para- 
pophyses. The hypapophysis is well developed and associates the latter processes, 
forming together a large crescentoid ridge, deeply notched at the middle. It proba- 
bly belongs to the same species as the vertebre above described from Timber Creek. 
The museum of the Academy contains a fragment of a left dental bone with a 
tooth, of a small Crocodile, or of a young individual of a large one, presented by 
C. C. Abbott. It was found in Monmouth County, N. J., and is represented in 
Figs. 22, 23, Plate IV. The specimen resembles in form the corresponding portion 
of the lower jaw of Harlan’s Crocodile, of which it may be part of a quite young 
individual. The suture for the splenial bone, however, does not reach the symphysis 
as in the fragment characteristic of Bottosawrus Harlani—ceasing about one inch 
short of it. Besides three alveoli, there are preserved portions of five others, and 
the third behind the symphysis still retains a tooth. The latter has a compressed, 
conical crown, with its inner and outer surfaces defined by a prominent carina-like 
ridge. The surfaces are finely rugose longitudinally, and the carine are rugose in 
a divergent manner. ‘The crown measures five lines in length and width, and a 
line less from without inwardly. | 
Another specimen belonging to the cabinet of the Academy, represented in Fig. 
8, Plate II, is a fragment of a small Gavial skull from the Green-sand of Burlington 
County, N. J. In construction it bears a resemblance to the corresponding part of 
the Vincenttown skull, to which I by no means feel sure it does not belong, though 
it differs in some important points. The forehead, in the fragment, between the 
position of the post-frontals is quite flat, while it is decidedly concave in the 
Vincenttown skull. ‘The frontal is less prolonged to meet the parietal than in the 
latter. The dividing ridge formed by the parietal between the temporal fosse is 
even slightly greater than in the Vincenttown skull, while the distance between the 
orbits at the anterior broken end of the specimen is only two inches. The upper 
surface of the parietal and frontal is also more strikingly foveated than in the 
Vincenttown skull. 
Four specimens of teeth, from Blackwoodtown, Camden County, N. J., pre- 
sented to the Academy by Dr. J. L. Burtt, may probably belong to the same species 
as the fragment of skull just described. The more perfect are represented in Figs. 
7, 8,9, Plate I. They have the form, curvature, and proportions of the teeth of 
the living Gavialis Gangeticus, and are proportionately narrower than those of 
Thoracosaurus Neocesariensis, and are-also more finely striated. 
Figs. 22, 23, Plate III, represent the mutilated crowns of two tecth of a croco- 
dilian reptile, supposed to have been obtained from a Green-sand deposit of North 
Carolina, submitted to my examination by Dr. Isaac Lea. One of the specimens, 
Fig. 22, is straight and conical, circular in transverse section, with an acute ridge 
in front and behind which defines the inner and outer surfaces. The latter at base 
are smooth, and apparently have been so at the apex, which is too much broken to 
determine the fact positively. The intermediate portion of the surfaces is nearly 
regularly fluted; the ridges separating the concave grooves extending from the 
3 March, 1865, 
