224 



FAUNA ANTIQUA SIVALENSIS. 



Length of p.m. 3 

 Width of ditto 

 Length of true m. 

 Length of true m. 

 Width of ditto 

 Length of true m. 

 Width of ditto 



1 (outer side broken) . 



2 (outer side) 

 (greate.st at middle) 



3 (outer side 2-65) 

 (greatest in front) , 



Length of diastemal edge remaining 



Inches 

 1-22 

 1-5 

 1-65 

 2-3 

 2-0 

 2-7 

 2- 

 1'2 



Memo. — The teeth, both upper and lower, show distinctly on their 

 comparatively thin enamel the parallel fibrous lines, as in Rhinoceros. 



The greater part of the palate is present, and the sinus has its bottom 

 in a line with the extremity of the last molar. 



The anterior pretnolar (p.m. 1) is sharp and wedge-shaped in iront, 

 wide behind. No trace of disc of pressure in front ; basal bourrelet 

 and isolated cusp shown by disc ; crown ground down low. 



P.m. 2, worn down to an uniform disc, with slight remains of two 

 fissures. 



P.m. 3, much worn, and like 2 ; bourrelet well marked. 



N'.B. The outer surface of the three premolars quite flat, without 

 chevrons. 



T.m. 1, antepenultimate true molar, mxich worn ; disc of isolated cone 

 confluent with the rest of the surface ; outer surface broken off, and the 

 W-shaped chevrons lost. 



Penultimate true molar worn down low (lower even than in the Sewalik 

 true mol. 1) ; the disc of its conical cusp confluent in front with main disc, 

 but distinct behind. The outer surface shows very markedly the W 

 pattern and bulges of the Sewalik form. The posterior angular fissure 

 ground down, leaving only a slight crescentic depression. 



The last trvie molar shows the disc of the cone distinct, or nearly so 

 (a fracture and chasm in the specimen conceals this partly). It shows 

 the chevrons and buiges very boldly ; and the posterior angular valley, 

 with its bounding ridges, quite intact and shaped exactly as in the Se- 

 walik species. 



In a general way, the Pikermi species differs from the Sewalik one in 

 having the last molar longer than the penultimate, the reverse of which 

 occurs in the Sewalik. Also in the latter the true molars are broader in 

 reference to their length than in the Pikermi. 



The diastemal ridge is very sharj^, and there are no indications of 

 canines ; and none of the incisive slips of the Sewalik form. 



Of the lower jaw there are two specimens : one young, with both 

 rami and symphysis, and milk dentition ; the other very old, with both 

 rami, six molars on either side much worn, the whole of the symphysis, 

 the diastemal edge on left and right, and the greater portion of the eden- 

 tulous incisive margin. 



The following are the principal dimensions : — 



Extreme length of specimen . 



Length of line of 6 molars 



Ditto of 3 true molars .... 



Ditto of 3 premolars .... 



Length of diasteme to incisive border left side 



Width between diastemal ridges at base . 



Inches 



15- 

 8-9 

 6- 

 2-9 

 2-85 

 1-3 



