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 common Alligator. 



The conjoined bodies of the sacral vertebr8e, represented in Fig. 14, Plate III, 

 relate in size with the preceding, and difi'er in no important point with the homolo- 

 gous parts of the Alligator. 



Of the caudal vertebra?, one is the first of the series, distinguished by the double 

 articular convexity of the body, as seen in Fig. 15, Plate III. Unlike that of the 

 Alligator, it is broad and flattened beneath, resembling in this respect more the 

 condition of the bodies of the sacral vertebrae. 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 dift'er from the corresponding part in 

 the Alligator. Its head measures rather more than t^vo 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 aU from the 

 same individual. 



The vertebrae have had their arches fidly 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 vertebrae. 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 vertebrae 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, 



