134 



transversely. The plastron from the position of the pectoral scute impres- 

 sion backward becomes gradually and deeply concave. The deeper pari ol 

 the concavity is defined on the posterior lobe of the plastron by a narrow flat 

 ledge laterally, which widens behind on the angular processes terminating the 

 plastron. The sternal bridges are moderately convex, and are wide fore and 

 aft. 



The anatomical structure of the osseous plastron and the relative position 

 and number of its scutes are the same as in modern species of Testudo. 



The entosternal bone is subpyriform and wider than long. Its fore extrem- 

 ity reaches just in advance of the ends of the gular scute impressions, and its 

 back border reaches the groove defining the humeral and pectoral scute 

 impressions. 



All the grooves defining the scute impressions are well marked, being deep 

 and wide. The proportions of the scute impressions are nearly the same as 

 in recent testudines. 



The pectoral scute impression is longer at both extremities than interme- 

 diately. The groove defining it in front, commencing externally just in 

 advance of the bottom of the axilla, curves backward and inward, and then 

 turns forward and inward to the position of the back suture of the entosternal 

 plate. 



The measurements of the specimen are as follows : 



Inches. 



Estimated length in median line to bottom of poststemal notch : . 24 



Estimated length on each side to ends of poststemal processes' 26£ 



Estimated width 20 



Estimated length of anterior lobe' of plastron in median line 8 



Length of posterior lobe of plastron in median line 5 



Length of posterior lobe of plastron laterally 7 



Width of anterior lobe at bottom of axillse 12 



Width of posterior lobe at bottom of inguinal fossae 13 



Width at bottom of anterior prolongation of plastron 5 



Width at ends of poststemal angular processes 7£ 



Depth of poststemal notch 2£ 



Width fore and aft of sternal bridge 9| 



Length of entosternal plate 4J 



Width of entosternal plate 5f 



Length of hyosternal plate in median line . . 0^ 



Length of hyposternal plate in median line of 



Length of xiphisternal plate in median line 4£ 



Length of pectoral scute impressions in median line If 



Length of pectoral scute impressions where narrowest 1 



Length of abdominal scute impressions in median line 9 



Length of femoral scute impressions in median line : 1 3| 



