88 
TERTIARY YERTEBRATA OF THE FAYRM. 
nomenclature. There is also a larger tubercle at the })osteiior end of the anterior V, 
which likewise ])rojects backwards ; tins is the metastylid. There is a slightly 
develoj)ed cingulum on the two ])osterior prcmolars. 
'fhe lower molars are very similar to the premolars, but tlie column developed at the 
inner end of the hinder arm of the posterior V (the entoconid) is larger, as also is the 
metastylid. The third molar has a large talon with a sharp raised edge surrounding a 
deep fossa ; this is supported by a large root. In the recent Ilyracoids the talon has 
disappeared or is represented by a mere rudiment, but the root seems to be always 
present though of very small size, its function having been lost. 
C. 8635. Right and left maxillfe and portions of skull. The type described and figured in ‘A 
Preliminary Note on some new Mammals from the Upper Eocene of Egypt,’ p. 5, 
fig. 4; also on PI. VII. figs. 4, 5. The dimensions (in centimetres) of these specimens 
are : — 
Width of skull-roof at the supraorbital processes 56'0 
Length of tooth-series (molars, premolars, and canine) . . . 6’2 
„ molar and premolar series 5'7 
„ molar series 3'4 
„ preinolar series 2-5 
Greatest width of m. 3 P4 
,, length „ 1'5 
M. 8378. Plaster casts of the above specimens. Made in the British Masenrn. 
C. 10057. Two right upper molars, m. 2 and m. 3, the latter only slightly worn. Figured on 
PI. VI. fig. (J. The width of m. 3 is 1'2 cm., its length 1'4 cm. 
M. 9221. Plaster cast of the above specimen. Made in the British Musexun. 
C. 8631. Fragment of maxilla with ?xi. 1, ?n. 2, and part of m. 3. 
3C. 8869. Three left u])per molars. The width of m. 3 is IT cm., its length l’3cm.; length of molar 
series 2'9 cm. Presented hj the Egyptian Government, 1904. 
C. 8819. Portion of the base of a skull probably referable to this species or to N. magnum. This 
specimen includes the cra/m, together with the glenoid region of the squamosal; 
the tym{)anic has been lost. 
C. 8106 b. Right ramus of mandible with molars and premolars. The lengths of the teeth (in 
millimetres) in this specimen are: m. 3, 14 ; m. 2, 10; m. 1, 8 ; pxn. 4, 7 ; pm. 3, G; pm. 2, G ; 
pm. 1, 5. 
C. 8106 a. Portion of left ramus of mandible with inn. 4 and m. 1-3. The lengths of these teeth (in 
millimetres) are : m.3, 15 ; m. 2, 10 ; m. 1, 9 ; pm. 4, 7. 
M. 8868a. Right ramus of mandible with m. 1-3 and |n». 2-4. The lengths of these teeth (in 
millimetres) are : jn.3, 15 ; m. 2, 11 ; m. 1, 9 ; pxn. 4, 7 ; pxn. 3, G ; pm. 2, 5. 
Presexited by the Egyptian Goxxexmxxient, 1904. 
K 8399. Left ramus of mandible of a slightly smaller individual with xn. 1-3 and pxn. 4. 
Presexited by the Egypt iaxi Govexmxnent, 1902. 
