16 UNDETERMINED CROCODILES. 
and portions of the others, but so far as it is preserved it corresponds in form with 
that of the Alligator. The fifth dorsal has its body more compressed laterally than 
in the specimen above described from Timber Creek, and the hypapophysis is abso- 
lutely very much more robust than in the latter, though the vertebra is smaller. In 
the Barnsboro’ specimen the anterior articular concavity of the body is quadrilateral, 
whereas it is broadly cordiform in the Timber Creek specimen. In the former the 
hypapophysis is excavated in front; in the latter it is plane. These differences in 
two characteristic vertebre are, perhaps, sufficient to indicate that they belong to 
two species. 
Comparative measurements of the two vertebra are as follows :— 
Barnsporo’ Sp. TIMBER CREEK SP. 
Lines. Lines. 
Length of body inferiorly . : . : . . ; 20 22 
Length of body laterally. ; : é 0 é é 5 PAY 22 
Height of body anteriorly . é 5 ¢ é . : ey 18 
Width of body anteriorly . ‘ : ‘ 0 5 : . 16 22 
Thickness of body at middle ‘ : : 5 : : ap 12 17 
Thickness of hypapophysis . * . 5 6 , : nS) 6 
Breadth of vertebral arch laterally. 3 . 5 : SS 20 
Width of vertebral canal. é : : : : < a BEG 7 
Height of vertebral canal . . : ' : : : apy ths 8 
The specimen of the shaft of a femur is three inches and a third in circumference, 
and resembles the corresponding portion of the same bone in the Alligator. 
The dermal bones are square, differ in size, and are coarsely foveated. Two of 
them form a median elevation without being carinated; the others are flat. One 
of the more perfect measures two inches by twenty lines; another measures two 
inches eight lines by two inches. 
The museum of the Academy contains two mutilated bodies of posterior dorsal 
or of lumbar vertebre, of mature age, from Ameytown, Burlington County, N. J., 
presented by T. A. Conrad. The specimens, excepting in being devoid of the 
hypapophysis, agree with the bodies of the dorsals above described, and are like 
those in the living Alligator. 
In the same museum there are the bodies of three vertebrae, which have lost 
their arches at the sutural attachment, from Jobstown, Burlington County, N. J., 
presented by Dr. E. Hallowell. One of the specimens, represented in Fig. 6, Plate 
II, apparently of the fifth cervical vertebra, is much less convex posteriorly than in 
the specimens above described, and has its parapophysis wider and much less 
robust. Its hypapophysis is a small longitudinally cleft tubercle. The body is 
nineteen lines long, sixteen wide anteriorly, and fifteen high. The remaining 
specimens are the bodies of two posterior dorsals or lumbars, twenty lines long, and 
resemble the corresponding bones in the living Alligator. In the same collection, 
and from the same locality and donor, there is another specimen consisting of the 
body of a posterior dorsal vertebra with the coosified abutments of its arch remaining. 
The body agrees in its form and proportions with those just described, and measures 
twenty-one lines in length. 
The body of a posterior cervical vertebra, from the Green-sand of St. George’s, 
