RHINOCEROS LEPTORHINUS, 375 
tubercle, m, is commonly, but not constantly present at 
the entry of the valley, 6. I have never seen it in an 
upper molar of the tichorhine Rhinoceros. 
Professor Jager has figured an upper molar tooth from 
the opposite side of the jaw to that in fig. 141, in the 
Second Part of his ‘ Fossilen Seeuge-thiere Wiirtembergs,’ 
fol., 1839, tab. xvi., fig. 31. It was discovered in a sand- 
pit (“sand-grube”) at Kirchberg, in Wirtemberg, and 
exhibits about the same amount of attrition, the same 
characteristic form of the principal valley, the anterior 
basal ridge, the prominent longitudinal ridge (d’), and the 
expanded convex bases of the inner lobes, separated by the 
wide beginning of the valley, as in the Clacton leptorhine 
molar. Professor Jiiger notices the latter character,* and 
the little tubercle (a) at the base of the valley, which 
is likewise present in our Clacton leptorhine molars ;- but he 
does not allude to the more important character, which his 
figure represents, of the simple termination of the valley (6). 
The zealous investigator of the Wirtemberg Fossils 
appears not to have perceived the specific resemblance 
between the molars from Kirchberg and that from Crozes 
(Gard), figured by Cuvier, tom. cit., pl. xi., fig. 4. And, 
as Cuvier had not obtained evidence to connect these speci- 
mens with his 2h. leptorhinus, nor, indeed, appears to have 
appreciated their difference from the molars of the ticho- 
rhine Rhinoceros,t Professor Jiger had no clue .to the 
* Professor Jager, after noticing the general resemblance of the fossil tooth 
with a corresponding one of the African two-horned Rhinoceros, observes, 
“allein er unterscheidet sich von ihm ausser der Grosse durch die mehrere 
Rundung und Trennung der innern Abtheilungen, wodurch er sich noch insbe- 
sondere von demselben Zahne yon Cannstadt, tab. xvi. fig. 10, unterscheidet, 
so wie durch den kleinen hicker in der Mitte zwischen beiden. p. 180. 
++ This is more strongly developed in the molar teeth of the Rhinoceros incisivus 
(Acerotherium, Kaup). The Constadt tooth above cited is a molar of the Fh. 
tichorhinus, closely agreeing with that from Chartham, fig. 122. 
+ The molar tooth of the tichorhine Rhinoceros, figured in the ‘ Ossemens 
