1S70.] -^^ ' [Cope. 



Not uncommon. It is considerably less stout than the preceding-. The 

 edges of the posterior lobe of the plastron are thinned out by an submargi- 

 nal groove. As in other Emydoids there is a marked concavity for each 

 l^ubic bone. The suture between the hyo- and hyposternal bones is less 

 interlocking than in A. agilis, and less fine than in A. pectoralis. I have 

 suggested that it may have possessed a slight mobihty in life. Its face is 

 longitudinally grooved in the hyposternal, and a corresponding convexity 

 of the face of the hyosternal fits it. In a specimen from Medford, IST. J., 

 the posterior lobe is 5 inches 9 lin. long, and 5 inches, 8 lin. wide at the 

 inguinal notches. Hyosternal of nearly equal thickness ; medially 7 lines. 



Adoccs vtomengeksis, Leidy. 



Emys vyomingensis, Leidy, Proc. Ac. Nat. Sci., Phila., 1869, p. Gfi. 

 Baptemys toyomingensis, Leidy, loc. cit., 1870, January. 



Best known from an almost complete specimen consolidated by the con- 

 tained mass of mineral. There are three intermarginal bones, of which 

 the middle one is more elongate than the others. There is a weak carina 

 on some of the posterior vertebral bones. The posterior marginal bones 

 are not revolute. The costal bones are delicately grooved in the length of 

 the carapace. The anterior extremity of the anterior sternal lobe is nar- 

 rowed, prominent, and truncate. Length of the whole animal about two 

 feet. 



Found near Ft. Bridger, Wyoming Territory, by Dr. Van Carter. 



The genus Baptemys to which this species is referred by Leidy, appears 

 to be the same as Adocus. 



ADOCUS PKAVTJs, Leidy. 



Emys pravus, Leidy. Proc. Aca. Nafl. Sci., Phila., 1856, 303. Creta- 

 ceous Rept. U. S. 108. Adocus pravus, Cope. Synopsis Batr. Kept. N. 

 Am. 129. 



This species is as yet known only from the original specimens, in the 

 collection of the Geological Survejs of New Jersey. The plastron is thin- 

 ner than in three preceding, and the hyosternals embrace the mesosternum 

 extensively. This distinguishes the species from A. agilis where the me- 

 mos' e nal emargination i much wider than deep. Width of an'erior lobe 

 of sternum at epi-hyosternal suture, four inches. 



Upper bed of Cretaceous Green sand, New Jersey. 

 Adoctjs agilis. Cope. 



Geological Survey of New Jersey, App. C. p. 734. 



Represented chiefly by an almost complete plastron from the excava- 

 tions of the West Jersey Marl Company, in the l^pper bed of the upper 

 Cretaceous Green Sand of New Jersey. 



This specimen belonged to an individual of larger size than any hereto- 

 fore referred to the genus, and one characteristicaUy ornamented by a 

 peculiar scvilpture. 



The extremities of both lobes are broken off ; the margin of the poster- 

 ior is thinned out, and carries an acuteness of edge to the inguinal notch 

 where the margin is quite thick. The outhne of the caudal scuta is very 

 convex anteriorly ; that of the femorals is gently convex towards the 



