234 TEETH OF RHINOCEROS FROM ILFORD.
to be of great interest, the only other instance of which I am
aware occurring in a fourth premolar of the upper jaw which
Dr. Falconer referred to R. etruscus and which is figured in the
Palaeontological Memoirs, vol. ii., Pl. xxv., fig. 6. This latter
specimen is from one of the Italian Pliocene deposits and is now
preserved in the museum at Pisa.
The next specimen to be noticed was also obtained by Mr.
G. White from one of the Uphall sections. This is a slightly
worn penultimate molar of the left upper jaw. The crochet is
thin and wedge shaped and is projected well across the trans-
verse valley. The external wall gives off a large combing plate
converging at a right angle towards the crochet, while just
above the latter from the anterior barrel projects another little
combing process. The large combing plate is placed nearly
diagonally to the anterior outer angle of the tooth. The barrels
have their apices compressed and somewhat twisted, making the
entrance to the transverse valley appear very wide. There is a
small prominent tubercle in the entrance of the latter between
the barrels. The dimensions of this tooth are:—
Antero-posterior length external) of crown .. 30 inches
Antero-transverse width, at base .. 25 ,,
Postero-transverse width, at base .. 1.9 ,,
This specimen is very characteristic of the R. leptorhinus
Cuvier, pro parte, to which species I have referred it.
In the collection of Dr. Frank Corner, F.G.S., there is a
fine first upper true molar of the left side obtained by him from
the Cauliflower Brickyard. This has the crochet thin and wedge
shaped, and given off at a somewhat acute angle. A small
combing plate is projected from the external lamina in a line
with the antero-external angle. The posterior valley of the
tooth is still intact. The anterior colline is large and shows the
apical contortion characteristic of the species to which I have
referred it. There is a well marked emarginate bourrelet passing
round the base of the front colline. The posterior barrel or
colline is broken, but shows apical contortion in section. The
enamel is smooth, with a rather thick coat of cement upon the
lower part of the sides of the crown. The dimensions of this
tooth taken at the base of the crown are :—
Antero-posterior length (externally) .. 2.49 inches
Antero-transverse width .. .. 2.66 ,,
Postero-transvere width .. .. 2.05 ,,