304 PEOCEEDINGS OP THE GEOLOGICAL SOCIETY. 



The "ridge- formula" in these specimens yields the same ciphers as 

 were found to hold in the Italian specimens ; and they agree in the 

 other characters of a broad crown, with low ridges and thick plates 

 of enamel. 



Figs. 5 and 5 a represent a finely preserved entire specimen of 

 the antepenultimate or first true molar, lower jaw, left side, com- 

 posed of eight principal ridges, with front and back talons. The 

 six anterior ridges are worn. The disks of the first three ridges are 

 wide and open, but irregularly indented, with a tendency to mesial 

 expansion, and surrounded by margins of thick enamel, which is 

 vertically channelled externally, and slightly crimped ; the posterior 

 ridges show the apices of six or seven digitations ; the interspaces 

 filled with cement between the ridges are open, and the ridges 

 well apart. 



The dimensions are — inches 



Length of crown 5*3 



Width in front . . . . ......;... 1-6 



,, behind 2-3 



Height of the seventh plate 2*5 



One of the distinctive characters of the species, namely, the low 

 height of the crown in reference to the breadth, is well exhibited. 

 The specimen is dark-coloured and heavy, from ferruginous infiltra- 

 tion. It was discovered at Mundesley, and belonged to Mr. S. 

 Woodward (Norwich Museum). 



Another left lower antepenultimate true molar of a larger in- 

 dividual, and more advanced in wear, is represented by figs. 6 and 6a. 

 The crown presents a front talon and eight ridges, all of them 

 worn ; the disks are wide and open, and . the vallicular interspaces 

 are also wide ; the enamel-edges thick, and in some of the plates 

 disposed to slight crimping, with irregular angular expansion. The 

 annular disks of the seventh ridge are of large size. This tooth 

 bears the large anterior fang. It is a very characteristic specimen 

 of E. meridionalis. 



The dimensions are — inehe 



Length of crown 5*5 



, Width of crown at second ridge 2-2 



„ „ behind 2*65 



Height of crown at seventh ridge, barely worn 2-0 



The specimen is hard, heavy, and dark-coloured, and is marked as 

 having come from Mundesley (Norwich Museum). 



Pigs. 7 and 7 a represent a fragment, comprising the anterior two- 

 thirds of the penultimate or second true molar of the lower jaw, right 

 side. It includes seven worn ridges. The disks of wear are wide, and 

 separated by broad bands of cement ; the rings of the digitations 

 are large ; the plates of enamel are thick, with angular flexures 

 and deep channelling on the outer surface, but free from crimping. 

 The specimen is black and heavy, and bears patches of marine, 

 incrustation. 



