1(56 



tioii of ilie second subinarginal scute area witli an internal projecting angle 

 intermediate in extent to that of the former specimens. On one side, also, a 

 small portion of the tirst submarginal area is retained, and this appears to 

 indicate that it was nearly of the size and shape of that in the first-described 

 specimen of Baena. 



Comparative measurements of the three described specimens of Baena 

 arenosa are as follows : 



Leugth of first vertebral scute at middle 



Breadth of first vertebral scute at middle 



Leugth of second vertebral scute at middle 



Breadth of second vertebral scute at middle . 



Leugth of third vertebral scute at middle 



Breadth of third vertebral scute at middle 



Length of fourth vertebral scute at middle 



Breadth of fourth vertebral scute at middle 



Length of fifth vertebral scute at middle 



Breadth of fifth vertebral scute at middle 



Width of first costal scute internally 



Width of second costal scute internally 



Width of third costal scute internally 



Width of fourth costal scute internally 



Length of anterior prolongation of the plastron 



Breadth at base of anterior prolongation of the plastron . . 



Length of posterior prolongation of the plastron 



Breadth at base of posterior i^rolongation of the plastron . 



Breadth of pedicles of plastron 



Length approximately of pedicles of plastron 



Leugth of gular scutes internally 



Breadth of gular scutes at back border 



Length of humeral scutes internally 



Breadth of humeral scutes at back border 



Length of pectoral scutes Internally 



Breadth of pectoral scutes at middle 



Breadth of pectoral scutes at back border 



Length of abdominal scutes internally 



Breadth of abdominal scutes at middle 



Breadth of abdominal scutes at back border 



Length of femoral scutes internally 



Breadth of femoral scutes at back border 



Length of caudal scutes internally 



Fore and aft diameter of first scute of pedicle 



Fore and aft diameter of second scute of pedicle 



Fore and sjft diameter of third scute of pedicle 



Fore and aft diameter of fourth scute of pedicle 



Liues. 



36 

 30 

 35 

 37 

 29 

 37 

 32 

 48 



37 

 32 

 21 



46 



48 

 50 

 62 

 26 



24 

 32 

 41 

 31 

 15 

 41 

 34 

 28 

 21 

 21 



16 

 20 



99 



Lines. 



22 

 36 



35 



30 



35 



31 



28 



30 



26 



40 



34 



36 



30 



17 



35 



41 



48 



52 



58 



24 



10 



14 



26 



19 



24 



45 



31 



22 



38 



29 



26. 



22 



22 



18 



24 

 20 



Lines. 



35 

 32 

 34 

 32 



33 



38 

 30 



37 



44 



52 

 56 

 24 

 10 

 15 

 21 

 22 

 22 

 50 

 33 

 20 

 44 

 28 

 24 

 19 



