14 UNDETERM IX ED CROCODILES. 



I have not had the opportunity of inspectmg other fossil remains which may 

 positively be referred to the Botfosanrus Harlanl. 



Among the fossils from the New Jersey Green Sand, described by Mr. Owen, in 

 the Journal of the Geological Society, Vol. V. p. 380, before mentioned, there was 

 a cervical vertebra of a crocodilian different from that upon which he proposed the 

 name of Crocodilus hasifissas. This second vertebra, from its having the inferior 

 apophysis of the body, or the hypapophysis, short and flattened, he views as indi- 

 cating a species, for Avhich he has proposed the name of Crocodilus has'druncatus. 

 The vertebra, supposed to characterize the latter, is of a size which relates to that 

 of the individual to which the jaw fragments above described belong, and probably 

 also appertained tq Harlan's Crocodile. 



Since writing the above there have been presented to the Academy, by Horatio 

 C Wood, a numbc>r of small fragments of the lower jaw of BoUosaunis JIarlani, 

 from Burlington County, N. J. The specimens, however, present no further char- 

 acters in relation to the species. Accompanying them there is a tooth, represented 

 in Fig. 1-i, Plate XVIII, which is a reduced one of the same form as that already 

 described. 



I have also recently received for examination, from the Burlington Co. Lyceum 

 of Natural History, several small fragments of a jaw, two teeth, and a large costal 

 rib, probably belonging to the same species. 



The fragments of a jaw are uncharacteristic. One of the teeth has a quadri- 

 lateral fang two and a half inches in circumference. The crown is quadrate mam- 

 miliform, but has lost the greater part of its enamel. The other tooth is represented 

 in Fig. 13, Plate XVIII. It has a compressed cylindrical fang a little less in cir- 

 cumference than the preceding. The crown is compressed mammiliform, strongly 

 rugose, and has its inner and outer faces defined by prominent carina-like ridges. 

 It measures eight and a half lines long, ten lines wide at base, and seven and a half 

 lines from without inwardly. 



Undetermined Sjpecies of Crocodiles. 



Of other remains of Crocodiles, with vcrtebree constructed on the same plan as 

 the living representatives of the family, I have seen a number of specimens from 

 the Green-sand of New Jersey apparently indicating several species different from 

 the preceding. Among these is a collection of bones belonging to the same indi- 

 vidual, from Timber Creek, Gloucester Comity, N, J., presented to the Academy 

 by AV. P. Foulke. They consist of two cervical, a dorsal, the sacral, and two caudal 

 vertebra?, and portions of both humeri. The vertebra? indicate an adult animal, as 

 the arches are completely united Avith their respective bodies, and those of the 

 sacrum are firmly coosified. Their comparatively small size renders it improbable 

 that they should belong to either of the species previously indicated. 



The bones are black, heavy, and firm, but imfortunately the vertebra? have had 

 most of their processes broken off since their discovery. 



The l(\ist mutilated of the cervical vertebne, apparently the sixth, represented in 

 Fig. 12, Plate III, is rather less than two inches in length, independent of the 



