Vol. 70.] AND ASSOCIATED MAMMALIAN REMAINS. 



89 



edge of the crown (PL XV, fig. 2 c) widens below to a triangular 

 tumid area, which is sharply bounded by the outer face, the inner 

 worn face, and the constricted neck of the tooth. Whether or 

 not this area was originally covered to any extent by enamel is 

 uncertain : appearances rather suggest that it is invested, instead 

 of enamel, with a direct continuation of the cement-layer of the 

 root. The posterior (lateral interstitial) edge of the crown 

 (PI. XV, fig. 2 d) is sharp, and is not produced below into any 

 inner (lingual) protuberance or heel. 



The root of the tooth is complete, somewhat deeper than the 

 crown, and tapers only slightly downwards from the constricted neck 



Fig. 3.— Restoration of the skull caul mandible of Eoanthropus 

 dawsoni, left lateral view; nearly a third of the natural size. 



to the truncated lower end. It is irregularly ovoid in transverse 

 section (PL XV, fig. 2e), the postero-external (lateral-interstitial + 

 labial) face being gently convex, while the antero-internal (median- 

 interstitial + lingual) face is flattened. It is invested with a 

 distinct layer of cement, which is seen in cross-section both at the 

 lower end and at the base of the crown on the inner (lingual) face. 

 Much of this cement, especially on the flattened face, appears to 

 be deposited in small, ill-defined, and irregularly-arranged globules. 

 The following measurements (in millimetres) may be cited: — 



Depth of crown preserved (measured along - the outer face) ... 11 '5 



Maximum (antero-posterior) width of crown 10*0 



Do. (interno-external) breadth of crown 10'5 



Do. width of the worn inner face 9'0 



Depth of root 1 8'0 



Width of flattened face of root at the upper end 9*5 



Do. do. do. do. at the lower end 7*0 



Smaller diameter of root at the upper end 7'0 



Do. do. do. at the lower end 5*0 



