27i 
TEllTIAliY VERTEBRATA OF THE FAYtM. 
Tomistoma keriinense, Andrews. 
lOO'). TomistonuL I’cvmiense, C. W. Andrews, (Jeol. Ma^. [5] vol. ii. p. 484. 
Type Specimen. — An imperfect rostrum, the premaxillary region being lost; 
( reological Museum, Cairo. 
This species difiers from T. yavialoides in having a more gradually tapering snout 
and less rounded orbits. Tlie teeth are more nearly equal in size, larger, and set at 
wider intervals than in otlier species of the genus. 
Form. cC* Loc. — 13irket-el-Qurun beds (Middle Eocene) : 12 kilometres W.S.W. of 
Gar-el-Geliaimem. 
It is unfortunate that this species is very imperfectly known, since its remains 
occur in the beds below those at Qasr-el-Sagha in which T. afrlcamtm is found, and 
better specimens might have thrown some light on the succession of forms from this 
horizon to the Upper Eocene species Tomistoma gavialoides. The snout, which is the 
best specimen available for description, is much like that of T. yavialoides in general 
form. Immediately in front of the orbits its surface is curved regularly from side to 
side, much as in T. schlegeli, but it is somewhat more depressed, a condition which 
is continued throughoiit the length of the rostrum. The tapering of the })reorbital 
region is quite gradual, more so than in T. gavialoides (see PI. XXIll. fig. 3 a) ; 
the orbits arc less rounded than in that species, though less elongated than in 
T. schlegeli. The specimen shows that the nasals meet the premaxillfe in the manner 
characteristic of the genus, thus excluding the maxilloe from union in the middle 
line on the upper surface of the snout. I’he interorbital bar is broader than in 
T. gavialoides. 
The teeth, judging from the alveoli, were large and were directed more forwards 
and outwards than in T. schlegeli, from which this form is also distinguished by the 
absence of pits for the reception of tire tips of mandibular teeth. I he teeth seem to 
have been more nearly equal throughout the series than in T. schlegeli or T. afrieannm, 
and are separated by wider intervals, so that between the level of the ])osterior end 
of the palatine processes of the premaxilhc and the anterior angle of the posterior 
palatine fossa there are only nine teeth, while in T. schlegeli, in the same sj)ace, there 
are ten, and in T. gavialoides twelve. 
A portion of the back of a skull, including the occipital surface and the roof as far 
as just in front of the supratemporal fossm, was also collected by Mr. Ijeadnell in the 
same locality. So far as it is preserved, this [)art of the skull is almost identical with 
that of T. gavialoides. 
