208 



it is a semicircle, and is impressed by a median longitudinal furrow : the 

 posterior rugous disc is also elongated, and is confluent with the anterior 

 one in the present example, indicating that the horns were very large and 

 more compressed than in the existing species. The occipital surface in- 

 clines backwards and the ridge overhangs the condyles. The inter- 

 maxillary bones are longer than in the existing species ; but the most 

 important anatomical character of the present extinct Rhinoceros is the 

 extension of the bony septum of the nose to the anterior extremity of 

 the nasal bones, which, instead of standing out freely, bend down, and 

 become confluent with the vomer and the intermaxillary bones. The 

 specific name tichorhinus has reference to this peculiarity, which adds so 

 much solidity and strength to the support of the anterior horn. 



Presented by Dr. BucMand. 



848. A cast o r the right horizontal ramus of the lower jaw of the Rhinoceros 



leptorhinus, Cuv., with the two posterior molar teeth, much abraded by 

 mastication in situ, and the sockets of the five anterior molars. These 

 extend to the anterior extremity of the fragment, the outer contour of 

 which inclines inwards so as to clearly indicate its close proximity to the 

 anterior end of the symphysis : the posterior margin of this conjunction 

 is opposite the interspace between the second and third molar. The 

 evidence of the shortness of the symphysis and the forward position of 

 the anterior molars concur in proving the present fossil to belong to the 

 extinct Rhinoceros, " a narines non cloisonnees," or the Rhin. leptorhinus 

 of Cuvier, which appears to be the most common species in the newer 

 tertiary deposits of Italy. 



The original of the present cast was discovered in the till or freshwater 

 deposits at Walton in Essex. 



Presented by John Brown, Esq., F. G.S. 



849. A fragment of the right ramus of the jaw of the Rhinoceros leptorhinus, 



Cuv., with the three posterior or true molars in situ: they are much less 

 worn than in the preceding specimen, and well exhibit the characteristic 

 double oblique crescents of enamel upon the grinding surface. 

 The original was discovered in the till at Walton in Essex. 



Presented by John Brown, Esq., F. G.S. 



