88 TERTIAET VERTEBEATA OF THE FAYtlM. 



nomenclature. There is also a larger tubercle at the posterior end of the anterior V, 

 which likewise projects backwards ; this is the metastylid. There is a slightly 

 developed cingulum on the two posterior premolars. 



The lower molars are very similar to the premolars, but the column developed at the 

 inner end of the hinder arm of the posterior V (the entoconid) is larger, as also is the 

 raetastylid. 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 Hyracoids 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 maxillae 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 



„ premolar series 2'5 



Greatest width of m.'S 1'4 



,, length „ , 1'5 



M. 8878. Plaster casts of the above specimens. Made in the British Museum. 



C. 10057. Two right upper molars, m. 2 and m. 3, the latter only slightly worn. Figured on 



PI. VI. fig. 6. 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 Museum. 



C. 8631. Fragment of maxilla with m. 1, m. 2, and part of m. 3. 

 M. 8869. Three left upper molars. The width of m. 3 is 1"1 cm., its length 1"3 cm.; length of molar 



series 2'9 cm. Presented hy the Egyptian Government, 1904. 



C. 8819. Portion of the base of a skull probably referable to this species or to S. magnum. This 



specimen includes the hasis cranii, together with the glenoid region of the squamosal; 



the tympanic 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 ; pm. 4, 7 ; pm. 3, 6; pm. 2, 6 ; 



pm,. 1, 5. 

 C. 8106 a. Portion of left ramus of mandible with pm. 4 and m. 1-3. The lengths of these teeth (in 



millimetres) are : m.3, 15 ; m. 2, 10 : w. 1, 9 ; pm. 4, 7. 

 M. 8868a. Right ramus of mandible with m. 1-3 and pm. 2-4. The lengths of these teeth (in 



miUimetres) are : m. 3, 15 ; m. 2, 11 ; to. 1, 9 ; pm. 4, 7 ; pm. 3, 6 ; pm. 2, 5. 



Presented by the Egyptian Government, 1904. 



M. 8399. Left ramus of mandible of a slightly smaller individual with m. 1-3 and pm. 4. 



Presented by the Egyptian Government, 1902. 



