TOM ISTOMA KEUUNENSE. — PSEPHOPirORUS EOC^.NUS. 
275 
C. 9350. Rostral portion of skull, incoinpleto anteriorly. The typo spociinen (l(“scril)e<! in the Gleol. 
Ma^. [5] vol. ii. |). 484. The diinensions (in cenliinetres) of this sp(‘ciinen are : — 
Total length so far as ])reserved 40 
Distance from front of ])osterior palatine fossa) to posterior 
end of palatine processes of preinaxilla) 29-2 
pistance from orbit to posterior end of facial processes of 
premaxilla) 25 
Width immediately in front of orbits Idapp. 
„ at binder end of premaxillre 5 
C. 9351. Posterior portion of a sknll 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 ATIIECZL. 
Family SPHAFGID.E. 
Genus PSEPHOPHORUS, V. Meyer. 
[Nenes Jahrh. (1847) p. 579.] 
Psephophorus eocsenus, Andrews. 
[Text-fig. 87.] 
1901. Psephophorus eoccemts, Cl. 4V. Andrews, Geol. Mag. [4] vol. viii. pj). 440-441, tig. 3. 
1903. „ ,, von Reinach, Abhaiidl. Senckenberg. natnrf. Gesell. vol. xxix. pt. i. 
])p. 58-59. 
Tijpe Specimen . — A nearly complete left humerus, described and figured in 
Geol. Mag. [4] vol. viii. p. 441, fig. o ; 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. & Loc. — Qasr-el-Sagha beds (Middle Eocene) : north of Birket-el-Qurun. 
This species, which is the only representative of the suborder Athecoe found in these 
beds, is known only from the humerus (text-fig. 87), which differs widely in form from 
the humeri of all land and freshwater Chelonians, and from those of all the marine 
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