UNDETERMINED CROCODILES. 15 
articular convexity of its body. Inferiorly, the latter is divided by a median carina 
expanding in front into a broad flat space without a distinct hypapophysis, other- 
wise the specimen presents nothing remarkable by which to characterize it. ‘The 
other vertebra of the neck, apparently a fourth or fifth, has the inferior carina of 
the body almost obsolete—commencing in a small tubercle behind, and fading away 
as it approaches a concavity extending between the parapophyses or inferior transverse 
processes. The latter are more robust than in the former specimen, and appear to 
have been conjoined by a ridge-like hypapophysis, though this is too much broken 
to judge of its true character. 
The dorsal vertebra, Fig. 13, Plate III, the fifth of the series, has about the same 
length as those of the neck, and is nearly as broad anteriorly as it is long. Its 
hypapophysis is a robust mammillary tubercle, but it is otherwise like the corre- 
sponding bone of the conmmon Alligator. 
The conjoined bodies of the sacral vertebra, represented in Fig. 14, Plate III, 
relate in size with the preceding, and differ in no important point with the homolo- 
gous parts of the Alligator. 
Of the caudal vertebrae, one is the first of the series, distinguished by the double 
articular convexity of the body, as seen in Fig. 15, Plate II]. Unlike that of the 
Alligator, it is broad and flattened beneath, resembling in this respect more the 
condition of the bodies of the sacral vertebra. The second specimen, from near 
the middle of the tail,is much mutilated. It measures rather more than two inches 
in length, and appears to have had the same form as in the Alligator. 
Of the fragments of humeri, one consists of a portion of the shaft of that of the 
right side, and measures three inches in circumference ; the other is the proximal 
extremity of the left humerus, and does not differ from the corresponding part in 
the Alligator. Its head measures rather more than two inches in its greater diameter, 
and a little more than one inch in its lesser diameter. 
Recently Prof. Cook has sent to me for examination a small collection of Croco- 
dile bones belonging to the collection of Rutger’s College. The specimens were 
obtained from near Barnsboro’, Gloucester County, N. J., and consist of four ver- 
tebrae, the shaft of a femur, and four broken dermal bones, apparently all from the 
same individual. 
The vertebra have had their arches fully coosified with the bodies, so that they 
may be considered as having belonged to an animal of mature age. ‘They belonged 
to a smaller individual than the specimens above described, and perhaps to a different 
species, for several present some peculiarities of form. 
Two of the vertebre, Figs. 4, 5, Plate II, belonged in the cervical series between 
the fourth and last, and are probably the fourth and fifth, The bodies measure an 
inch and three-quarters in length, independent of their posterior convexity, and 
correspond in general form with those of the Alligator. ‘The hypapophysis of the 
fourth, Fig. 4, is a thick semicircular ridge extending between and below the level 
of the parapophyses. In the fifth, Fig. 5, it is a longer, straighter, and less well 
developed ridge, slightly notched in the middle, 
The other two vertebra are the first and fifth dorsal, and have their body about 
as long as the cervicals. The first dorsal has lost its hypapophysis, spinous process, 
