210 



THE EXTINCT BATRAOHIA, REPTILIA 



If the coracoid found near them belongs to the same skeleton, the body was remarkably slender, and the fore- 

 limbs possessed comparatively little power. 



From the clays below the upper bed of Cretaceous Green Sand at Ilornerstown, Mon- 

 mouth Co., N. J. Discovered by Jno. G. Miers. 



BAPTOSAURTTS FRATERNTJS, Marsh. 



ITidisaufus fratemus, Marsh, Amor. Jour. Sci. Arts, 1809, :S07. 



This species is established on an anterior dorsal and two posterior dorsal vertebras, (bund not Car IV cadi other, 



and probably part of the same series. They are about the same size as those just described, and have many points of 

 resemblance to them, but differ in having the centra less depressed and less elongate. The anterior dorsal has the zy- 

 gapophyses less expanded, and their articular face more nearly vertical than the corresponding parts in the previous 

 species. It has also indications of a small hypapophysis, which in form and position resembles somewhat that of Mo- 

 saaaurus. The neural spine is compressed, of moderate height, and directed slightly forwards. The posterior dorsals 

 have the centra considerably less depressed than the anterior dorsals, and the neural arch rests upon the anterior two- 

 thirds of the centrum. The diapopophyses pass oft' horizontally, their upper Hat surface being nearly in the same 

 plane as the floor of the neural canal. At their extremities there is an articular face which is subtriangular. These 

 vertebra; are all much more depressed than those of Liodon Icevis, Owen, or L. validu.% Cope, and indicate an animal 

 smaller than either of those species, probably twenty-five or thirty feet in length. The remains were found near Ilor- 

 nerstown, New Jersey, by Mr. Meirs, at the same locality as those described above. 



The preceding description is quoted from Marsh, loc. cit. A. vertebra probably of this species is in the Museum 

 of the Academy Natural Sciences. 



HOLCODUS, Gibbes. 

 HOLCODUS ACUTIDENS, Gibbes. 



On Mosasaurus, Smithsonian Contribution's, 1851 9: Tab. Leidy, Cretaceous Reptiles, p. lis, Tab. X, lig. 17. 

 Cretaceous formation of Alabama and Mississippi. 



J'OLYUONODON, Leidy. 



Proceed. Acad. Nat. Sci., Phila., 1858. 221. 



This genus is only known from teeth. These are of remarkable and elegant form, 

 and could scarcely have pertained to animals which presented any close affinity to Mosa- 

 saurus. Their cutting edges are equally developed and acute on both anterior and pos- 

 terior aspects, and separate equal faces. Tin; facets are better defined than in any other 

 genus. There are two species, as follows : 



Facets six inner and seven outer. p. vet us. 



Facets four or five inner and outer. P. pectus. 



POLYGONODON VETTJS. Leidy. 

 hoc. Cit., 1858, 221 ; Cretaceous Reptiles, fab. IX., 12-18. 



Cretaceous Green Sand of New Jersey. 



