106 
TERTfARY VERTEBRATA OF THE FAYtTM. 
(Ippe 7 ' Dentition . — There are three pairs of incisors. The first pair (PI. X. fig. 3, i. 1) 
are in close contact in the middle line ; they are comparatively small, downwardly 
directed, prismatic teeth, each implanted in the premaxilla by a long backwardly 
curved root. Their transverse diameter is roughly ’8 cm. The second incisors (/. 2) 
form great downwardly directed tusks. Their anterior face is strongly convex, the 
posterior slightly flattened ; the tooth as a whole is strongly curved and tapers 
somewhat towards the root, which, in the adult at least, is closed. There is an oblique 
Text-fig. 41. 
Cast o£ the cranial cavity of Moeritherium hjonsi: A, from above ; B, from right side. 
r.h., cerebellum ; f.l., frontal lobe ; inf., pituitary body ; p., pseudosylvian depression ; o.l., olfactory lobe ; 
t.l., temporal lobe ; V., base of fifth nerve. | nat. size. 
wear-surface on the posterior side of the crown. No sufficiently well-preserved 
specimen has been found to show whether the enamel-covering was complete or not. 
In one skull these tusks project some 4'8 cm. from the jaw, but as their ends arc 
broken off above the commencement of the wear-surface, it is probable that when 
complete they protruded at least half as far again ; in this specimen the antcro- 
