oil 
TERTIARY YERTEBJiATA OF THE FAYCJM. 
it slopes away on eillu'r side' of a incclian ridge. Most of the up])er surface is covered 
with ])roudiient tubercles, Avhich show a tendency to arrangement in longitudinal rows. 
'I'wo douhh' rows of es])ecially large tubercles run on either side of the fontanelle, 
converging in front (jf and behind it; the o])ening itself is situated towards the front 
of the skull and at the bottom of an elongated furrow, the sides of which are not 
tuhercnlate. The snpraocci])ital does not project far behind the rest of the skull and 
evidently united closely with the large interneural plate. The epiotic processes 
piojcct strongly backwards and outwards, and bear on their postero-inferior 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. 
'The 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 com[)letely enclosed in its middle region. 
A pectoral spine, which ])robably belongs to this species, bears a row of transversely 
elongated tubercles along its convex border and near its extremity; the upper surface 
also is tuhercnlate. 
Form, cf- Loc. — Qasr-el-Sagha beds (Middle Eocene) : north of Birket-el-Qurun. 
C. 10197. Nearly complete skidl. The dimensions (in c(‘ntimetres) of this specimen are : — 
Length from basioccipital to tip of snout R2-5 
Greatest w idtli at posterior end IG'Tapp. 
„ ,, anterior end 17'5 
C. 10198. Portion of skull-roof, well preserved ])osteriorly and showing the senl[)ture. 
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 
„ SLipraoccipital to tip of snout 30 
Greatest width at posterior end 20 app. 
„ ,, anterior end fO'4 
Length of complex vertebra lO'S 
Fi'exeiitcd Inj the Eijijptlan Gocernnient, 1301. 
P.10250. Posterior halt of a skull. The gnaitest width at the posterior end is 1(1 cm. 
Fee^eiiled /p/ Jhiron dSopesu, PdOo. 
P.10251. Portions of two similar skulls. I’re.seiiled />// Haeon dSopesa, llKhl. 
P. 10245. I’ortion of skull, in which the .sculpture of the roollng-hones is well shown. 
