224 CHELONIA. 



As cranial characters, which would be deemed of sectional impor- 

 tance in the Testudinata, it may be mentioned that the pterygoids 

 are extensively separated by the basiphenoid, and that they articu- 

 late anteriorly with the vomer, which divides the palatines. 



Genus PSEPHOPHORUS, Meyer 1 . 



Syn. Macrochelys, Van Beneden 2 (non Gray) . 



Skull, as compared with that of Dermochelys, shorter, relatively 

 larger, and much more depressed, with thicker bones, but with the 

 same lateral maxillo-premaxillary process. A complete tessellated 

 carapace and plastron ; the former having the scutes of the larger 



Pig. 51. 



Psephophorus scaldi. — Ventral aspect cf the left humerus ; from the Pliocene 

 of Belgium. About \. g, head ; h, radial process ; i, ulnar process ; c, 

 ectepicondylar foramen. {After Dollo.) 



longitudinal rows devoid of carinas, and more approximated than 

 in the existing genus. Humerus (fig. 51) with the radial process 

 relatively larger than in the latter. 



Psephophorus, sp. 



Known only by the undermentioned specimen. It has been pro- 

 posed by Dollo, 'Bull. Mus. R. Hist. Nat. Belg.' vol. v. p. S3 (1888), to 



1 Neues Jahrb. 1847, p. 579. 



2 Bull. Ac. R. Belg. ser. 2, vol. xxxi. p. 13 (1871). 



