2 PKECEEDINGS OF THE NATIONAL MUSEUM vol. G6 



ridgeplates ; originall^^ there were probably 25. Measured on the 

 outer convex face the tooth presents 8 plates in a 100 mm. line; on 

 the inner, concave, face there are 9. The enamel, as shown on the 

 abraded surface, is thin, delicate, and little folded. Its thickness 

 rarely exceeds one millimeter. The thickness of the cement plates 

 and that of the dentine plates enclosed by the enamel are, on an 

 average, equal. 



A part of the upper right second molar (pi. 3, fig. 4) was yet in 

 use. During or after exhumation most of the outer half was lost. 

 It had been worn so that in front there remained only dentine and 

 behind this the bases of six or seven enamel plates. The part pre- 

 served is 98 mm. long and 78 mm. wide. The plates are divided at 

 the midline into an inner and an outer series of loops of enamel 

 and these loops are directed obliquely backward from the midline. 

 Wear had reached the level where the enamel of each ridgeplate 

 turns toward that of the adjacent plate and joins it. The loops 

 therefore enclose, not dentine, but cement. On the left side (right 

 side in the figure) there is a continuous band of enamel from the 

 first plate to the last one. The rear of this second molar fits quite 

 accurately against the front of the third molar. The two teeth 

 together had 18 ridgeplates in action. 



The lower right third molar (pi. 2; pi. 3, fig. 1) presents 23 ridge- 

 plates; there were originally 25, perhaps one or two more. The 

 occlusal border of the tooth is concave from the rear forward. "Where 

 .the ridgeplates are worn down, there was doubtless originally a 

 rounded boss. The base of the tooth is convex, but would have been 

 less so when the rear plates had reached their full length. On the 

 outer concave face are 8 ridgeplates in a 100 mm. line ; on the convex 

 face only 7. The hindmost plates are a little thicker than those in 

 front. The length of this tooth in its present condition, measured 

 from the middle of the summit of the ridgeplate in front to the 

 middle of the base of the hindmost, is 295 mm. The greatest length 

 was originally near 325 mm. The height at the hindmost worn plate 

 is 152 mm. The thickness is 90 mm. 



A fragment of the lower second molar appears to belong on the 

 right side and has a surface for contact with the next molar behind ; 

 but this third molar has lost the front plate and therefore the con- 

 tact surface. The loops of enamel of the second molar are divided 

 into two rows, as in the upper second molar, and the loops enclose 

 the cement. Only 4 ridgeplates are represented in this fragment. 



The symphysis of the lower jaw is present and about 200 mm. of 

 the right ramus. The beak is moderately prominent. A little to one 

 side of the symphysis the height of the jaw is 120 mm. There is 

 present a fragment of the tusk about 400 mm. long and about 150 

 mm. in diameter. 



