E. S. Lull — Fossil Dolphin from California. 217 



The torso of the fossil form was evidently fully as long and 

 deep as that of the dolphin used for comparison, though the 

 skull of the latter is materially larger. 



Sternum. — There are two impressions not far removed from 

 their normal position which I take to be those of two coalesced 

 and one isolated sternebrse. The outlines are very vague in 

 each instance but the anterior one seems to differ very mark- 

 edly from that of Delpliinns and to resemble more nearly that 



Fig. 



Fig. 7. Eight pectoral limb. % nat. size. ac, acromion process ; cor, 

 coracoid process; cun, cuneiform; h, humerus, anterior aspect ; ha, hume- 

 rus, internal aspect ; I, lunar ; m, magnum ; mcp, metacarpal ; p, phalanx ; 

 r, radius ; s, scapula ; set,? scaphoid ; t ?, ? trapezoid ; u, ulna ; unc, unci- 

 form. Drawn from the impression. 



of PlaMnista. The difference is mainly in the greater size of 

 the element in the fossil and in its simplicity of ontline. The 

 anterior margin has a simple semicircular notch about one-third 

 the width of the entire bone, whereas in Delphlnus the notch 



