TOMISTOMA KEEUNENSE.— PSEPHOPHOEUS EOC^NUS. 275 



C. 9350. Rostral portion of skull, incomplete anteriorly. The type specimen described in the Geol. 

 Mag. [5] vol. ii. p. 484. The dimensions (in centimetres) o£ this specimen are : — 



Total length so far as preserved 49 



Distance from front of posterior palatine fossae to posterior 



end of palatine processes of premaxillae 29-2 



Distance from orbit to posterior end of facial processes of 



premaxillae 35 



Width immediately in front of orbits 13 app. 



„ at hinder end of premaxilte 5 



C. 9351. Posterior portion of a skull from the same locality. The dimensions (in centimetres) of 

 this specimen are : — 



"Width of posterior end of skull-roof 17 



,, supratemporal fossa 5-8 



„ bar between supratemporal fossae 1-6 



Order CHELONIA. 

 Suborder ATHECvE. 

 Family SPHARGID^. 



Genus PSEPHOPHOEUS, v. Meyer. 

 [Neues Jahrb. (1847) p. 579.] 



PsephophorUS eOCSenuS, Andrews. 

 [Text-fig. 87.] 



1901. Psephophorus eoccenus, C. W. Andrews, Geol. Mag. [4] vol. viii. pp. 440-441, fig. 3. 

 1903. „ „ von Eeinach, Abhandl. Senckenberg. naturf. Gesell. vol. xxix. pt. i. 



pp. 58-59. 



Type Specimen. — A nearly complete left humerus, described and figured in 

 Geol. Mag. [4] vol. viii. p. 441, fig. 3 ; Geological Museum, Cairo. 



A species known only from the humerus, which has the ulnar crest more prominent 

 than in Psephophorus scaldii and the radial crest more oblique. 



Form. & Log. — Qasr-el-Sagha beds (Middle Eocene) : north of Birket-el-Qurun, 



This species, which is the only representative of the suborder Athecse found in these 

 beds, is known only from the humerus (text-fig. 87), which difiers widely in form from 

 the humeri of all land and freshwater Chelonians, and from those of all the marine 



2n2 



