214 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Lower Molar Series. 



[Jan. 



Species. 



Locality. 



Tooth. 1. 



2. 



3. 





/^ Pm. 3 1-38 



1-0 



1-08 







Pm. 411-42 



1-13 



1-22 







M. 1 11-45 



1-2 



1-23 







M. 2 1-75 1-26 



1-24 





Pakefield ■ 



M. 3 1-75 1-15 

 ! M. 3 !l-72 1-15 



1-18 

 1-19 1 







M. 2 11-72 1-25 il-22 







M. 1 il-59 1-19 i 1-2 



Ehinoceros Etruscus < 





iPm. 4il-45 1-12 1-22 





U Pm. 3 il-35 :rO jM | 







" I Pm. 4 



1-45 il-0 -95 





Forest-bed (Cambridge Mus.) - 



M. 1 

 M. 2 



1-5 112 1-12 

 1-75 1-2 1-15 i 







M.3 



2-2 |l-2 115 1 





Cromer (Ecy. John Grunn) ... j 



' M. 1 



1-85 '1-2 1-14 





M.2 



177 1-19 1-14 



\ 



M. 3 11-85 1 ... il-05 1 



( 





Pm. 1 



... ... ... 







Pm. 2 



1-19 ,0-72 '0-89 



1 1 



■r Rhinoceros Schleier- ! 



macheri, Kaup ...' 



Miocene, Darmstadt \ 



Pm. 3 

 Pm. 4 

 M. 1 



1-55 1-02 1-08 

 108 1-18 1-25 

 1-85 1-25 11-45 







M.2 



1-99 1-45:1-52 



[ 





M.3 1-85 1-38 1-25 





. 



Pm. 1,0-6 il-55! ... 

 Pm. 211-2 0-88 iO-9 



Acerotherium incisi- _ 

 vum, Kanp ' 



Miocene, Darmstadt - 



Pm. 3 1-4 0-95 

 iPm. 4 1-45 1-1 



1-5 

 1-1 





M. 1 il-65 llll 



115 







M.2 l-75il-25 



1-25 



I 





M.3 1-6 il-1 



1-09 



/ 



i 

 1 



Pm. 2:1-05 0-53 0-72 

 Pm. 3il-2 0-78 0-88 



Hhinoceros Simor- 



1 

 Miocene « 



Pm. 411-34 0-9 095 



rensis, LarUt ' 





M. 1 



1-42 1-yo U-y« 







M.2 



1-45 0-98 10 



V 



^ 



M.3 



1-48 0-9 



0-92 



6. Affinities. — The MegarMne and Leptorhine Ehinoceros present, 

 ^s we have seen in the preceding essays*, dental characteristics 

 which are now shared among the living and widely divergent species ; 

 the Etruscan, on the other hand, points rather backwards than for- 

 wards in time, and its dental characters are represented only by the 

 mnk-teeth of some of the Ehinoceroses that lived after its extinction. 

 The teeth of the genus Rhinoceros may be divided into two distinct 

 classes, characterized severally by the height or lowness of their un- 

 worn crowns, and especially in the case of the upper molar series. 

 To the high-crowned or hypsodontf division belong all the living 

 and all the Pliocene and Pleistocene species, with the exception of 

 Rhinoceros Etruscus and perhaps R. pachygnathus of Piiermi. To it 

 also belong all the Ehinoceroses from the Sivahk Hills. The typical 



* Nat. Hist. Rev.^ 1865, No. XIX. 

 t i;'4/os = height, 6^oti§=tooth. 



Quart. Journ, Geol. Soc. vol. xxiii. p. 227. 



