206 



THE EXTINCT BATRACHIA, REI'TILIA 



The other specimens from Monmouth Co. are considerably injured. The centrum of the first dorsal, or that with 

 the last trace of the hypapophysis, measures 8.10 inches in length, and the cup 2 inches In diameter. The surface on 

 each side of the trace of hypapophysis is strongly longitudinally striate. 



The third specimen is more posterior in position than any of the other vertebra described, and more compressed 

 in certain parts of the surface. 



It is an anterior dorsal, being without hypapophysis, having strong diapophyses, and strong aeurapophyses which 

 1 suspect to have borne zygapophyses, though these have been broken off. If differs from those of Mosasaurus, which 

 occupy the same position, in its greatly compressed elevated form, in the strength of the aeurapophyses, in the longi- 

 tudinal instead of vertical diapophyses, and in the hick of connection by elevation or otherwise between the diapophysis 

 and base of neurapophysis. 



The form of the articular ball is a, vertical oval with sub-parallel sides, and a, deep rounded emargination at the 

 neural canal. The centrum is much contracted immediately in advance of this, and the outlines above the diapophy- 

 ses are markedly concave. The neurapophysis rises at about one-fourth Ilic length of the centrum in advance of the 

 ball. The diapophyses have ovale bases deeper anteriorly, and are situate at the middle of the depth of the centrum 

 on the anterior half. The cup is strongly cordate, having an open concavity at Hie neural canal; the edges are thin. 

 The inferior surface presents a, narrow plane, concave extero-posteriorly, and hounded by the compressed sides, which 

 form a longitudinal concavity below the diapophyses. 



In. Lin. 



Length of vertebra below, 2 1 



Width in median plane below, 7.5 



Depth of cup, greatest, 1 8 



" least; 1 7.5 



" ball, 1 7.5 



Width " 1 5.7 



Length basis diapophysis, L8. 



This specimen was found near Medford, N. J., in the second green sand bed, and presented to the writer by 

 Charles Braddock, of Haddonfleld. 



The last described vertebra is erroneously named M. validus on Plate V. 



LIODON CONGROPS, Cope. 



Spec. nov. 



This species is indicated by a posterior cervical vertebra, which presents so many characters as to render its ex 



elusion from the present work scarcely proper. In size it bears some relation to the Mosasaurus minor, Gibbes, but is 



still smaller, and is separated at once by the round instead of depressed articular faces. 



The posterior articular fad' is the round one; the anterior is slightly depressed, and opposite the diapophyses and 

 neural canal slightly Battened, so as to give a. slightly tri-lateral superior outline to the cup. It is not excavated above, 

 as in the species of Clidastes. The hypapophysis is broken, but its base is unusually long and wide. The infero-an- 

 terior limb of the short diapophysis descends to the edge of the cup, considerably below its middle. The space it en- 

 closes with its superior ridge which extends info the anterior zygapopliysis, is reticulate striate. The whole surface 



below is minutely striate; the stria) become coarse as it approaches the ball. The latter is sum ilcil by a, groove, and 



its margin projects acutely beyond the adjacent surface of the centrum. The latter is much contracted behind the 

 ball, and the faces below the diapophyses are concave. Bases of neurapophysis striate. Neural arch broken away 

 above. Neural canal with epapophysia) ridge. 



Linen. 

 Length centrum with ball, 20.8 



" " to " 18 



" " " hypapophysis, 5.8 



Width base hypapophysis, 5.5 



