TEETH OF RHINOCEROS FROM ILFORD. 235 



This tooth I have referred to R. leptorhimis, Cuvier, pro parte, 

 of which it is very typical. It is the only example of this 

 species that I am acquainted with from the Cauliflower Brick- 

 yard. 



The last specimen I have to notice is in the collection of 

 Mr. J. P. Johnson who obtained it with others from the Uphall 

 section (Figs. 3 and 3a). This is a fine and slightly worn ante- 

 penultimate premolar of the left upper jaw. Its large size would 

 seem to indicate the p.m. 3 rather than the p.m. 2, but that 

 it is the latter is perfectly clear from the sub-triangular form 

 of tlie crown, the form of the anterior colline, and the absence of 

 a pressure scar in front. The latter character proves that there 

 was no first premolar in this individual. The anterior colline is 

 seen to form a completely isolated conical cusp exactly as in the 

 specimen figured by De Christol in his memoir in the Ann. des 

 Sciences Nat. ZooL, ser. a"'*", vol. iv., pi. 3, fig. 12. The apex of 

 this cusp is worn off, a small elliptical disk of wear being the 

 result. Figures 3 and 3a will give a much better idea of this 

 specimen than any description. It is referred to the R. leptorhinus, 

 Cuvier, pro parte, of which species it is very characteristic. Sub- 

 joined are the dimensions of this specimen together with some 

 corresponding ones given by Falconer of this species and by 

 Dawkins of the homologous tooth in R. heniitoechns. Falconer. 



P.m. 2 R. leptorhinus, Cmvi^x pro parte. {.=R. megarhimis, De Christol). 

 Ilford. Falconer op. cit. 



Antero-posterior length .. 16 in. i 55 in., 145 in., 1-95 in., 155 in. 

 Greatest-transverse width. . 176,, 170 in., i-6o in., 1-70 in., iGo in. 

 P.m .2 R. heinitoechus, Falconer (=R. leptorhinus, Owen), Dawkins, 

 (Q.f.G.S., vol. xxiii., p. 213). 

 Antero-posterior length .. 1-15 inches .. i 15 inches. 

 Greatest-transverse width .. 140 ,, .. i-28 



The distribution of the species of Rhinoceros in the Middle- 

 Terrace deposits of the Thames Valley below London is of 

 considerable interest. At Ilford R. hemioetchus is by far the 

 commonest form ; remains of R. leptorhinus occur in fewer 

 numbers but still fairly abundantly, while R. antiquitatis is of 

 very rare occurrence. At Grays Thurrock R. leptorhinus ranks 

 first in abundance, R. hemitoechus being the rarer ; and R. antiqui- 

 tatis not known from this locality. At Crayford and Erith on 

 the other hand the commonest remains are those oi R. antiquitatis. 



