TEliriAliY VERTEBRATA OF THE FAYtlM. 
ni4 
it sl()[)es away on cither side of a median ridge. Most of the upper surface is covered 
with ])roniinent tubercles, which show a tendency to arrangement in longitudinal rows. 
'Two double rows of especially large tubercles run on either side of the fontanelle, 
converging in front of and behind it ; the opening itself is situated towards the front 
of the skull and at the bottom of an elongated furrow, the sides of which are not 
tubercrdate. The supraoccipital does not project far behind the rest of the skull and 
evidently united closely with the large interneural plate. The epiotic processes 
])roject strongly backwairds and outwards, and bear on their postero-iuferior face an 
elongated surface for union with the post-temporals. The ethmoid is broad, and its 
anterior border nearly straight, so that the snout appears to be abruptly truncated. 
'I'lie anterior complex vertebra is long and biconcave as usual ; its ventral surface is 
deeply channelled for the dorsal aorta, and, in older specimens at least, the channel 
is completely enclosed in its middle region. 
A pectoral spine, which probably belongs to this species, bears a rovv of transversely 
elongated tubercles along its convex border and near its extremity ; the upper surface 
also is tuberculate. 
Form. & Loc. — Qasr-el-Sagha beds (Middle Eocene) : north of Birket-el-Qurun. 
C. 10197. Nearly complete skull. The dimensions (in centimetres) of this specimen are : — 
Length from basioccipital to tip of snout 3‘2 5 
Greatest width at posterior end IG'Tapp. 
„ „ anterior end 17 5 
C. 10198. Portion of skull-roof, well preserved posteriorly and showing the sculpture. 
P. 10240. Well-preserved skull, with anterior complex vertebra still united. The dimensions (in 
centimetres) of this specimen are : — 
Length from basioccipital to tip of snout 32-4 
„ supraoccipital to tip of snout 30 
Greatest width at posterior end 20 app. 
„ ,, anterior end lO'l 
Length of complex vertebra lO'S 
Frenented l»j the F(/i/ptlan Government, 1004. 
P.10250. Posterior half of a skull. The greatest width at the posterior end is 1(1 cm. 
Presented hp Baron Nopesa, 1905. 
P. 10251. Portions of two similar skulls. Presented hij Baron JSopesa, 1005. 
P. 10245. Portion of skull, in which the sculpture of the roofing-bones is well shown. 
