MEG-ALOHTEAX EOC^NUS. 93 



internal angle of the tooth is a small element, which is larger in pm. 4 than in pm. 3, 

 and absent in the other premolars, in which the postero-internal angle of the tooth 

 forms a shelf-like surface bordered by the cingulum. 



The canine is much worn, but seems to consist of a single blunt cusp borne on two 

 roots. Its posterior border is in contact with the anterior premolar. In front of the 

 canine the edentulous alveolar border of the maxilla extended for some distance. 



The width of the palate between the last premolars is 6"4 cm., and anteriorly 

 it must have been very concave from side to side. 



Skull (PI. VI. fig. 1 ; text-fig. 39).— A premaxilla (C. 10009) of extraordinary form 

 (PI. VI. figs. 1, 1 a), bearing a large tusk-Uke anterior incisor and the alveoli of two 

 other teeth, may be ascribed with considerable confidence to the present species. This 

 specimen was originally referred provisionally to the problematical Phiomia *, but 

 subsequently it was placed in its present position and a figure showing its probable 

 relationship with the maxilla of M. eoccenus was given f. The bone consists mainly of 

 a socket for the great rootless incisor-tusk {i. 1) which curves round almost in an arc 

 of a circle. The anterior border of the bone immediately above the base of the tooth 

 is rounded and continues so for some distance up : it then becomes sharp-edged and 

 the inner face is marked by a rough surface for union with another bone — the nasal. 

 The actual hinder border is broken away. The outer face is rendered strongly convex 

 in its upper portion by the socket of the great tusk-like incisor, but beneath this it 

 is concave from above downwards, the bone thinning suddenly towards the alveolar 

 border. The inner face beneath the surface for the nasal is marked by two broad 

 shallow grooves and its lower edge is roughened for union with the overlapping maxilla. 

 The palatine process (pl.p.) is a short stout projection which united in the middle 

 line with its fellow of the opposite side ; the sutural surface is deepest behind ; it 

 does not extend quite so far forwards as the anterior border of the tooth, but projects 

 some distance behind its posterior angle. 



The great first incisor (i. 1) is a rootless tooth, the socket of which perhaps extended 

 even into the maxilla. It is triangular in section, one angle being anterior but 

 rather nearer to the outer than the inner side, the outer face being narrower than 

 the inner. The anterior faces of the tooth are both enamel-covered, the enamel 

 being marked by slight longitudinal striae. Both these faces are convex on the whole, 

 but are marked by a slight longitudinal groove in the middle, that on the antero- 

 external face being the best marked. The posterior face is without enamel; its 

 wear-surface extends from the sharp tip of the tooth to within a short distance of the 

 alveolar border. Immediately behind the socket of this tooth there is a deep 

 depression formed by the converging edges of the alveolus which meet and form the 



* Andrews and Beadnell, 'A Preliminary Note on some new Mammals from the Upper Eocene of Egypt ' 

 (Cairo, 1902). 



t Geol. Mag. [4] vol. x. 1903, p. 340, fig. 2. 



