108 EMYS. 



portions, and both arc devoid of internal costal processes for articulating with the 

 vertebra', as in some of the land Turtles. The second plate (e) is marked by grooves 

 of the second vertebral and the first and second costal scutes. Its anterior angle 

 articulated with the first vertebral plate, its posterior angle with the third, and the 

 intervening border with the second. The narrowest portion of the fragment, 

 within the space covered by the second vertebral scute, measures twenty-two lines, 

 and the plate widens outwardly, to the broken margin where it is twenty-four lines. 

 The thickness of the plate at the vertebral margin is four lines and a half anteriorly 

 and five and a half posteriorly, and it thins outwardly to the broken margin where 

 it measures three lines and a half. Fig. 2 represents an inner view of the frag- 

 ment exhibiting the merest rudiment of a costal process at /. 



The fragment of the third costal plate (g) comprises two inches and a half of its 

 vertebral portion, which articulated with the third and fourth vertebral plates. It 

 is marked by grooves of the second and tliird vertebral scutes, opposite which it 

 measures twenty-three lines wide, and is reduced towards the broken outer margin 

 to twenty-one lines. The thickness of the plate at the vertebral border is six lines, 

 from which it thins off to the broken border to three lines and a half 



The first left marginal plate. Fig. 3, is marked by a crucial groove of the first 

 and second marginal scutes, the first vertebral scute and the first costal scute. The 

 marginal scutes did not extend to the middle of the length of the plate, the outer 

 edge of which is acute and everted, and almost twice the breadth of the costal 

 border. From the latter the plate increases in thiclcness to its middle, where it 

 measures nearly seven lines, and then thins outwardly to the acute free margin. 



The upper surfaces of all the plates present a closely, though somewhat obscurely 

 pitted appearance, recalling to mind the rain-drop marking on muddy or sandy 

 strata. This appearance, so diiferent from the reticular furrowing on the lines of 

 the Turtle previously described, precludes the idea of its belonging to the same. 

 The slight variation in breadth and moderate curvature of the costal plates as they 

 extend outwardly, indicate a depressed or low form of carapace as in the Terrapins. 

 The absence of costal processes for articulating with the vertebrae, in the specimens 

 of second and third costal plates, presents a relationship of structure with some 

 of the land Turtles. Together the fossil fragments present characters sufficient to 

 indicate a peculiar species. 



Eniy!$ praviis. 



Emys pravus, Leidy, Proo. Acad. Nat. Sci. Phila. 185G, 303. 



Among the Turtle remains, obtained by Prof. Cook from the Green-sand of Tinton 

 Falls, Monmouth County, New Jersey, are the greater portions of a hyosternal and 

 liyposternal plates, and a small fragment of the conjoined xiphisternals. These are 

 represented in Fig. 1, Plate XIX, and indicate a species differing from any of the 

 preceding, and supposed to belong to the geniis Emys. 



The under surface of the sternum was generally flat, and appears to have been 

 smooth, or witliout characteristic markings, though the eroded condition of the 

 specimens renders this point uncertain. The marks of scutes, if they existed, are 



