TERTIAET YERTERRATA OF THE FATIjM. 
29 G 
In this species, wliicli is the type of the genus, the shell is more depressed, wider 
and more uniformly oval than in S. lihijca from the beds above. It also differs in 
]K)Ssessing a com])aratively narrow nuchal bone, probably narrower than the anterior 
vertebral shield ; in the later form the reverse is the case. From S. j>o(Jocnemioi(l es, 
lit'inach, of the same horizon, this species is distinguished by the fact that the humeral 
shields are widely se})arated posteriorly by the intergular instead of terminating at the 
same point. 
Form. <f- Loc. — Qasr-el-Sagha beds (Middle Eocene) : north of 13irket-el-Qurun. 
Text-fig. 95. 
Palatal view of skull of Stcreo<j€nys cromcrl, restoi’ecl. 
hoc., basioccipital ; cr.jit., ectopterygoid wing ; f.i.c., fossa into which the internal carotid opens ; /.???., foramen 
inagmim ; i.n., internal nares ; m.v., maxilla; p.f., palatine foramen; pa., parietal; p/., palatine; 
premaxilla ; iderygoid ; quadrate ; soc., snpraoccipital ; sr/., squamosal. About | nat. size. 
The skull (PI. XXV. figs. 1-3 ; text-fig. 95) in its general structure is closely similar 
to that of Podooiemis, but is broader and more depressed. The supraocci])ital {soc.) is 
produced backwards into a large median ])rocess, the up])er surface of which ai)pears on 
the roof of the skull between the hinder ends of the parietals These bones tiro 
very large, forming the greater part of the sktdl-roof ; laterally they join the qnadrato- 
iugals and jugals in a straight suture, forming xvitli those bones a complete covering 
for fhe temporal fossa;, as in Fodocnemis. The frontals ( /.) are comparatively small, 
and extend forwards to about the middle point of the orbits, where they join the 
