WILLISTON: new cretaceous turtle. II 



hand, is even more elongated than in Ckeio?ie, and is apparently 

 even longer than I have represented it in the drawing. The bone is 

 in all respects the humerus of a sea-turtle. 



Length from top of articular surface 202 mm. 



Extreme length, about 260 



Greatest diameter of a scapular articular surface. . 44 



Least width of shaft 40 



Width through lower part of radial crest 67 



Greatest width distally 80 



Thickness of shaft 17 



Radius. (Plate V, fig. 2.) 



Lying nearly in connection with the portion which is preserved of 

 the left humerus, are the nearly complete radius and a portion of the 

 ulna. The radius has been but little compressed, and it is in excel- 

 lent preservation, save for the part that is lost. Both extremities are 

 expanded, apparently about the same. The upper end is thicker 

 than the lower, and has slight striate markings near the border of the 

 articular surface. About 25 mm. from the upper extremity, near the 

 inner border, there is a roughened protuberance, the bicipital tuber- 

 osity. The shaft is quite smooth and oval. 



Carpal? (Plate Yl, fig. 3.) 



A single bone, which from its size I take to be a carpal and not a 

 tarsal, is very thin and fiat, nearly smooth, and oval in shape. It 

 measures 52 mm. in its greatest and 38 mm. in its opposite diameter, 

 and is nowhere over 5 mm. in thickness. It has some very incon- 

 spicuous markings near the articular margin. 



Metacarpals. 



The four bones represented in the accompanying figure were lying 

 upon the end of an ulnar fragment, and almost over the radius and 

 nearly in the position in which they are figured, the two inner ones 

 being crossed. That they belong to the manus I have no doubt, and 

 that they are metacarpals and not phalanges seems evident from 

 the shape of their articular ends. Their measurements are as follows: 

 8. Length 48 mm. 



Width of distal extremity 9 



8a. Length 87 



Width proximally 19 



Width distally 18 



8b. Length 55 



Width distally 20 



8c. Length 55 



Width proximally 15 



Another finger bone, lying across the end of the radius is shorter 

 than any of the foregoing, and may be a phalanx. One end is want- 



