Case.] Turtles. 385 



on the outer surface of the bone, which is the head proper. 

 The part representing the radial crest is lower than the re- 

 mainder and bent inward, so that it stands at an angle to the 

 rest of the bone. The whole proximal end is thin and convex 

 externally. Below the expanded portion the shaft of the bone 

 is contracted and thicker, but does not become cylindrical. The 

 distal end is thin and expanded, with the articular surface thin 

 and continuous. There is a groove on the internal side of the 

 distal end, indicating the position of the entepicondylar foramen. 

 Plate lxxx, figure 7. 



The coracoid has a rather small head, with two articular faces. 

 Back of the head the bone is much contracted to form a shaft 

 somewhat triangular in outline, and is then gradually expanded 

 into a broad, spatulate extremity. The bone is a little shorter 

 than the humerus. Plate lxxx, figure 6. 



