106 TESTUDO. 



The epistcrnal plates in the median line are two inches in length. 



The hyosternal plates are two inches and eight lines long in the middle, and 

 articulate with the third to the fifth marginal plates inclusive. 



The hyposternal plates are two inches two lines long, and articulate with the 

 sixth and seventh marginal plates. 



The xiphisternal plates are convex at their margin, and are notched inter- 

 mediately. 



Scutes of the Carapace. — (PI. XX. 1.) The vertebral scutes, from the. second to 

 the fourth inclusive, are hexahedral or quadrate, with bow-shaped sides, and are 

 nearly equal in size. The fifth vertebral scute is prolonged anteriorly, and measures 

 two inches in length. , 



The nuchal scute is three lines wide, and the pygal scute two and a quarter inches. 



The gular scutes together measure two inches in width, and encroach for half an 

 inch upon the ento-sternal plate. 



Scutes of the Plastron. — (PI. XX. 2.) The pectoral scutes are two and three- 

 quarter inches long. 



The humeral scutes internally are two-thirds of an inch long, and externally at 

 their anterior border curve forward and outward to the axilljB, and at their posterior 

 border diverge backward and outward in a straight line, so as to join the axillary 

 scute, half of the fourth and the whole of the iifth marginal scutes. 



The abdominal scutes are two inches and ten lines long, and join the sixth and 

 seventh marginal scutes and the inguinal scute. 



The femoral and caudal scutes, in the median line, measure about one inch and 

 two-thirds long. 



MEASUREMENTS. 



Inches. 

 Length of the sternum ........... SJ 



Breadth of the sternum ........... GJ 



Length of the antero-posterior curve of the carapace ...... 12i 



Height of the carapace from the level of the sternum ...... 5 



Length of the lateral marginal plates . . . . . . . . 2^ 



Height of latter above the level of the sternum ...... 3 



Testndo On'eni, Leidy. 



(Pl. XXI., XXIV. Fig. 4.) 

 Emys Oweni, Leidy : Proo. Acad. Nat. Sci., 1851, v., 327. 

 Tesiudo Oweni, Leidy: Proc. Acad. Nat. Sci., 1852, vi., 59; Owen's Rep. of a Geol. Surv. of Wise, etc., 568. 



This species is established upon a nearly entire carapace and plastron. The 

 former has nearly the same degree of convexity and form of that of the Box Tor- 

 toise [Cistudo Carolina). 



The costal plates had not yet united by suture with the marginal plates. 



The latter, at the sides of the carapace, are vertically convex, with their upper 

 border elevated two and a half inches above the level of the sternum. Anteriorly 

 and posteriorly they are less inclined than the contiguous dorsal plates. 



