00 
TERTrvMiT VEKTEBRATA OF THE FAYtJM. 
1)0 regarded as consisting of two elements {a.e. and j).c.) im])erfectly divided ; the 
])ostero-intcrna] angle of the tooth forms a greatly worn shelf-like projection. In this 
tooth, as in the premolars, the enamel of the ectoloph is very thick, so that in wear it 
forms a ])romineut cutting-edge. The suture between the maxilla and premaxilla 
crosses the outer edge of the alveolar border immediately in front of the canine and 
runs on to the face — at tirst upwards, then backwards. On the inner side of the 
alveolar border the suture runs forwards, the maxilla apparently sending a process 
foi’wards beneath the preniaxilla, somewhat like that described in Mceritherium. As in 
tlu' latter genus, this peculiarity is probably correlated with the presence of enlarged 
tusk-like incisors. Immediately in front of the suture is the alveolus of a single- 
rooted third incisor, the crown of which must have been in contact with that of the 
canine, so that it actually formed one of the series of cheek-teeth, which thus consists 
of three molars, four premolars, a canine, and the last incisor. About 4 ram. in front 
of this is a smaller alveolus for the second incisor. Anterior to this the alveolar 
border becomes concave and widens out to the socket of the great trihedral first 
incisor. Of this tooth, unfortunately, only the base is preserved : it is triangular in 
section and probably grew from a persistent pulp. The convexity on the side of the 
face caused by its alveolus can be traced back to the level of the first premolar. The 
antero-external and antero-internal faces are covered with enamel, but this is absent 
from the posterior face. In short, it may fairly be said that, except for the j)resence 
of the two small posterior incisors, the premaxilla and its tusk-like tooth are 
juactically identical in form with those of the modern Hyrax, and there is no clue 
t<» the manner in which this curious modification arose. 
The lower teeth are similar to those of S. antiquum^ except that the meta- and 
ento-stylids are more strongly developed (see PI. VI. figs. 4, 4 a). 
K. 8398. liiglit maxilla and premaxilla with molars, promolars, canine, and the base o£ the first 
incisor : i. 2 and i. 3 are represented only by their alveoli. The type specimen 
(h'scribed in Geol. Mag. [.5] vol. i. p. 214; figured in Geol. Mag. [4] vol. x. p. 340, 
tig. 2, as /S', atdiqiiinn ; also on PI. VI. figs. 3, 3 A. The dimensions (in centimetres) 
of this specimen are : — 
Length of tooth-series (moLars, preinolars, canine) 
„ premolar series ....... 
„ molar series 
„ pm- 4 
„ //?». 3 
,, pm. 2 
» 1 
Total length of the specimen is lO’l cm. 
7-8 
:}-2 
3-i) 
1-7 
lo 
1-0 
1-0 
•9 
•8 
•8 
