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. etvuscus and which is figured in the 

 Palaontological Memoirs, vol. ii., PI. xxv., fig. 6. This latter 

 specmien is from one of the Italian Pliocene deposits and is now 

 preserved in the museum at Pisa. 



I'he 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 oflf 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 .. .. ig ,, 



This specimen is very characteristic of the R. leptovhinus 

 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 projecie. i 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 „ 



