362 



RHINOCEROS. 



timate true molar. This anterior crochet survives when the true crochet 

 is worn out ; this is seen in De Blaiuville's drawing of the penultimate, 

 which shows a kind of trefoil to the anterior disc. 



5. In Acerath. Goldfiissi, the posterior tubercle forms a long crenu- 

 lated ' gradus,'' most salient at the outer end ; the same is seen in Lartet's 

 R. Simorrensis and in Kaup's Aceratherium. The ridge is confluent 

 inside, free and high outside (like the bourrelet in the Mastodons.) 



6. The mouth of the valley of the last molar is very open, and will 

 admit the forefinger easily. 



Compared the Malaga specimen, after making these observations, 

 and remarked the following peculiarities : — 



1. The last true molar behind has only a moderate tubercle, as in the 

 Tuscan specimens, and has no ' gradus ' ridge at base behind. 



2. The mouth of the valley is comparatively narrow; in the last 

 molar it will not admit the finger as in De Blainville's Auvergne 

 specimen ; the anterior barrel is broad and has a crochet constriction. 



3. Unfortunately the apex of the outer ridge-summit of the crown is 

 broken in the three last molars, but what remains of the low crown 

 presents an undulated surface. 



4. There is no true constriction of the anterior barrel, which in the 

 antepenultimate is very broad. 



5. There is a duck's bill pattern to the termination of the posterior 

 valley, with an accessory plate forming a reniform outline, as in Acera- 

 therium, but no subdivision of the crochet into plates in any of the teeth. 



6. The most important and marked difference is that the second 

 premolar (p.m. 2) has no disc of pressure in front — no p.m. 1 ! p.m. 3 

 has two fossettes and the anterior inner cone (barrel) is isolated all 

 round by a deep fissure and gives a narrow ovate disc. 



7. There is a basal bourrelet to p.m. 2 and 3, but not very marked. 



8. The basal bourrelet to the premolars of the Auvergne specimen 

 forms actually a sharp raised rim ; the bourrelet is very little pro- 

 nounced in comparison in the Malaga specimen, in which it does little 

 more than make a bridge between the barrels, while in the Auvergne 

 specimen it sweeps round the anterior barrel, rising obliquely in the 

 posterior. 



I infer the specimen to be of Rhinoceros Etmscus. 



Dimensions. 



Joint length of three last molars 



Joint length of 2nd and 3rd p.m. 



Length, outer edge of p.m. 2 



Width of ditto behind 



Length of p.m. 3 



Width of ditto, outer . 



Length of t.m. I in middle . 



Greatest width in front 



Length of t.m. 2, outer 



Length of ditto, middle 



Width in front at base 



Length of t.m. 3, from tubercle to outer bourrelet 



