8 MR. G. A. BOULENGER ON CHELONIAN REMAINS. [Jan. 6, 



88 millimetres. Owing to the less advanced age of the specimen, 

 the notch between the head and the external tuberosity does not exist ; 

 this notch I also find feebly marked in the skeleton of the not full- 

 grown Dermoclielys coriacea preserved in the British Museum. The 

 fossil specimen is broken just above the radial process, but the outer 

 posterior tubercular prolongation of this process, so characteristic of 



Fix. 6. 



Proximal portion of left humerus of Eosphargis gigas. -J nat. size. 



the Athecse, is well preserved, and agrees strikingly with the figure 

 of Psepliophorus rupeliensis given by Dollo \ with which the type- 

 specimen of Eospliargis gigas also agrees, as stated by Lydekker ^. 



In Eosphargis, as in Fsephopliorus rupeliensis, the intertubercular 

 pit is close to the radial border of the humerus, whilst in Psepho- 

 phorus scaldii and in Dermochelys it is nearly equally distant from 

 either border. The whole shape of the humerus of Psephophorus 

 scaldii approaches so much nearer to JDermochelys that it appears to 

 me questionable whether it is correct to refer P. scaldii, in the 

 absence of any information as to the cranial and exoskeletal 

 characters, to the genus Psephophorus rather than to Dermochelys. 



1 Bull. Mus. Belg. v. 1888, pi. iv. fig. 7. 



2 Cat. Foss. Eept. iii. p. 220. 



