^o 



TRANSACTIONS OF THE WAGNER FREE 



Measurements of the plastron, in part approximate and estimated, are 

 as follows : 



Length of anterior extremity in median line to a level with the 



bottom of the axillary notches, ...... 280 mm. 



Length of posterior extremity to a level with the bottom of the 



inguinal notches, ........ 260 " 



Depth of axillary notch from fore part of epiplastron, . . . 390 " 



Depth of inguinal notch from end of xiphiplastron, . . 3^5 " 



Breadth of plastron at bottom of axillary notches, . . . 520 " 



inguinal " . . . . 520 " 



" at posterior groove of the pectoral scutes, . . . 640 " 



" at anterior groove of the femoral scutes, . . . 640 " 



Greatest thickness of epiplastron at median suture, . . . 70 " 



Breadth of xiphiplastron along anterior suture, . . . 250 " 



Greatest thickness of hyoplastron, . . . . . . 46 " 



Breadth of entoplastron, . . . . . . . 250 " 



Breadth of caudal notch, ........ 200 " 



Depth of " " 45 " 



Thickness of hyoplastron near bottom of inguinal notch at 



groove of the inguinal scute, . . . . . . go " 



Breadth of xiphiplastron along anterior groove of the caudal scute, 1 80 " 



Length of caudal scute area laterally, ...... 100 " 



The specimens of the limb bones consist of fragments of the bones of 

 the shoulder and pelvis of one side, the shaft of a humerus, a mutilated 

 femur, and a tibia, all of which resemble the corresponding bones of recent 

 Tortoises. Of the scapula, the intermediate portion with the glenoid articu- 

 lar surface is preserved. The adjacent part of the acromial process is 47 

 mm. in its greater and 22 mm. in its lesser diameter. 



A mutilated coracoid from the glenoid articulation is 155 mm. long, and 

 at the articulation is 60 mm. in breadth. 



The shaft of a humerus is much more robust than the corresponding 

 portion of the femur. The deltoid insertion, strongly marked, extends to 

 near the middle of the shaft. A shallow but conspicuous groove descends 

 from the front of the latter towards the outer condyloid ridge and appears 

 to substitute the vascular canal in a nearly similar position in recent Tor- 

 toises. The measurements of the specimen are as follows : 



Circumference of shaft of humerus where narrowest, 



Fore and aft diameter " " " 



Lateral 



Breadth of distal extremity, estimated. 



125 mm. 

 41 " 



43 " 



