56 FOSSIL MAMMALIA OF THE 



of this molar. The longitudinal rugosity of the enamelled summits and the shining smooth- 

 ness of the outer convex base of the crown are repeated. 



The last tooth in place (6) is a larger one with some modification of the crown. This 

 is not longer, vertically, but is more extended from before backward, than in the preceding 

 teeth. This extension is due to a ridge or talon continued from the hind basal half of the 

 main outer cone ; the summit of which, as well as those of the two inner cones, have suffered 

 fracture. The basal part projects outwardly with a polished coat of enamel ; but the bulge 

 is less than that in the antecedent teeth ; and, instead of being continued into one cusp, it 

 divides, after inclining inward, into two smaller cusps, with the rugous enamel. The 

 hind lobe of the tooth is less prominent externally than the front one, and terminates in a 

 notched enamel border. 



There seems to be a socket of a smaller molar behind the above-described tooth, and 

 the zygomatic process of the maxillary indicates that socket to terminate the molar series. 



A portion of the delicate bony palate extending from the inner side of the alveolar 

 tract of the maxillary is exposed in the marly matrix. 



On the hypothesis that the crack is a suture defining the premaxillary, the tooth (i) 

 would be an incisor of a proportion reaching that in Biprotodonts, and the next single- 

 rooted tooth (2) would be a smaller incisor. 



It is remarkable that the only other specimen with teeth of the Bolodont type should 

 also be maxillary. It is represented in PI. Ill, fig. 6, nat. size ; 6 a, b, magn. 4 diara. The 

 specimen is a crushed portion of upper jaw with three teeth of the right and two of the 

 left molar series. The latter includes the tooth corresponding to the foremost of the right 

 side and one in advance ; the right series, accordingly, has two teeth posterior in position 

 to those shown on the left side. By the obhquity with which the posthumous crushing 

 force has pressed upon the fossil, the left teeth show their outer side, the right teeth their 

 inner side. The bony palate is entire between these right and left teeth, and shows its 

 median suture. 



In the oblique view of the two molars of the left maxillary (fig. 6 a), the outer side, 

 which is chiefly seen, shows one chief cone, the summits of the two inner cones also 

 coming into view; the three molars of the right maxillary (fig. 6 b) show more directly 

 the two main cones of the inner side ; the summit of the main outer cone also coming 

 into view in the second of these teeth. 



The main outer cone answers to that marked a in the molars numbered 3, 4 in fig. 5, 

 A and B ; the two main inner cones in fig. 6 b, answer to those marked b and c in figs. 

 5, A and b. 



But the teeth in the present specimen show some minor features, not so recognisable 

 in the preceding one. 



The outer main cone {a) in the second left tooth developes from the hind part of its 

 base a talon or thick ridge {e) which inclines obliquely inward, and joins the hind part of 



