TEETH OF RHINOCEROS FROM ILFORD.
235
This tooth I have referred to R. leptorhinus, 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 the 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. 2me, vol. iv., pl. 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. hemitoechus, Falconer.
P.m. 2 if. leptorhinus, Cuvier pro parte. (=R. megarhinus, De Christol).
Ilford. Falconer op. cit.
Antero-posterior length .. 1.6 in. 1.55 in., 1.45 in., 1.95 in., 1.55 in.
Greatest-transverse width.. 1.76,, 1.70 in., 1.60 in., 1.70 in., 1.60 in.
P.m .2 R. hemitoechus. Falconer (=R. leptorhinus, Owen), Dawkins,
(Q.J.G.S., vol. xxiii., p. 213).
Antero-posterior length .. 1.15 inches .. 1.15 inches.
Greatest-transverse width .. 1.40 ,, .. 1.28
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. hemioctchus 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 of R. antiquitatis,