272 PROCEEDINGS OF THE GEOLOGICAL SOCIETY, 



The principal dimensioBS of this specimen are — incbes. 



Extreme length of crown surface 8 



Width of crown surface at first ridge 2-35 



„ „ at the fourth ridge . . 2-8 



„ „ at the seventh ridge . . 1-8 



Height of the seventh lidge 2*5 



"Width of second disk at mesial expansion .... 0-95 

 There are eight disks of wear to a length of 8 inches, being an 

 average of one ridge to the inch, a proportion corresponding closely 

 with that presented by the oldest teeth of the African Elephant. 

 The front fang, in the last lower molar of the latter species, gene- 

 rally supports two principal ridges besides the anterior talon. It 

 is inferred, therefore, that the corresponding fossil tooth of E. {Lox- 

 odon) priseus, when entire, was composed of ten or eleven ridges, 

 and that it was about 11 inches long. 



Another specimen (no. 18966 of the British Museum Collection), 

 also reputed to have been procured from the brick-earth deposits of 

 the valley of the Thames, is represented by fig. 6 of pi. 14 of 

 the work above cited. It is a fragment mutilated at both ends, 

 showing only the entire disks of five partially worn ridges. The 

 outline of the disks corresponds very closely in form with those of 

 the posterior ridges of the larger specimen from Gray's Thurrock, 

 described above. There is the same mesial angular expansion, and 

 a still greater tendency to the disks assuming a crescentic form. 

 The mutilated condition of this specimen renders its identification 

 somewhat doubtful; but it is inferred to belong to E. (Lo.vod.) 

 priseus, and to be a penultimate molar of the lower jaw, left side. 

 The dimensions are — inches. 



Length 5 



"Width of the crown behind 3 



Height of „ „ 2-8 



Besides the five entire ridges, the fractures pass through the 

 middle of a disk at either end ; so that the specimen may be consi- 

 dered to possess six ridges in a length of 5 inches, being an average 

 width of -83 to each, near the summit, where but little worn. 



The only other British specimen referable to this species, that 

 has come under my observation, is a fragment of a lower jaw, with 

 which I have lately become acquainted, in the rich and valuable 

 collection of mammalian remains from the ISTorfolk coast, between 

 CCromer and Lowestoft, formed by the Bev. John Gunn, of Irstead, 

 •wbo has liberally placed this specimen, with many others, at my 

 disposal for description*. It is a rolled and mutilated fragment, 

 rcomprising the symphysis and anterior part of both rami, the beak 

 ■apopTiysis being entirely rubbed off'. A single molar is present on 

 ithe left side ; none on the right, which is very mutilated. 



The tooth, which is inferred to be the penultimate true molar, 

 presents the crown nearly entire and well worn. Its length is de- 

 termined by the anterior and posterior fangs, which are exposed, 



* The author mtended to figure this specimen also (vide p. 270, footnote). — Edit. 



