SlXOl’A ETFIIOIMCA. 
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OO 
blade and a small talon. The liigh anterior ])ortion consists of an antero-internal and 
a postero-external cnsp, which tend to form a cntting-blade, and a small postero-internal 
cusp. The talon in the tyj)ical species is more or less basin-sha])ed. 
It is with considerable hesitation that the fraganent of a mandible described below 
has been referred to a member of this genns, which has hitlierto been almost, if not 
quite, confined to North America. Tlie European genera nnd J^roviverro 
are very closel}^ allied to Sinopa, but the present specimen differs from the mandibles of 
s])ecies referred to them both in being considerably larger and in possessing more 
massive molars, the cusps of which are neither so high nor so })ointed. lUitimeyer 
has already referred a small Creodont fiom the Eocene of Egerkingeii to Stypolophns 
[Sinopa], distinguishing it from Proviverra and Cynohymnodoii on these same grounds, 
and his specimen must be very similar to that now described and made the type of a 
new species. 
Sinopa etliiopica, sp. nov. 
[Plate XIX. tigs. G, 6 a.] 
Type Specimen. — Portion of left ramus of mandible with pm. 4 and m. 1-3 hi situ 
(PI. XIX. figs. G, G a) ; Geological Museum, Cairo. 
This species is about the same size as Sinopa agilis (Marsh), but differs from it, 
and apparently from the other American species also, in the relatively smaller size of 
the last premolar and fir>t molar compared with the last molar. It also differs from the 
typical members of the genus ui having a trenchant talon, the cutting-edge of which 
is situated rather towards the outer side of the tooth ; in the other species the talon is 
basin-shaped. This difference suggests that when more is known of its structure, this 
species may require to be placed in a new genus. 
Form. & Loc. — Fluvio-marine beds (Upper Eocene): north of Birket-el-Qurun. 
C. 10193. Portion of the left ranuis of the nianJIhle with the somewhat broken molars and fourth 
premolar. Type specimen figured on PI. XIX. figs. 6, 6 A. 
The ramus, so far as preserved, is of nearly the same depth throughout ; posteriorly 
it is broken away about 1‘.5 cm. behind the last molar ; there seems to have been a well- 
marked masseteric fossa. The last premolar {pm. 4) consists of a large, somewhat 
compressed, main cone, with small anterior and })osterior basal cusps, the posterior one 
being the smaller and forming a short cutting-talon ; the basal length ot this tooth is a 
little greater than that of m. 1. The molars increase in size from before backwards. 
Each consists of a high tricns[)id anterior portion and a talon. In all the teeth the end> 
of the main cus])s have been broken away, but it can be seen that the postero-external 
cusp was the largest and with the antero-internal formed an impertect cutting-blade ; 
the postero-internal cusp is small and intimately connected with the inner face of the 
* Abhandl. Scliweiz. Pal. Ges. vol. xviii. (1891) p. 104, pi. vii. figs, lu, 11. 
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