342 RHINOCEROS. 



ging the foundation of a store-house at Chatham, Kent. 

 The figure shows the outer side of the two crescentic or 

 seini-cylindrical lobes, which form the crowns of the lower 

 molars of the Rhinoceros. Douglas presented the speci- 

 men to Sir Ash ton Lever ; and, after the dispersion of 

 the Leyerian collection, it was purchased by H. Warburton, 

 Esq., M.P., late President of the Geological Society, and 

 was presented by him to the Museum of the Society. 



With regard to other parts of the dentition of the lower 

 jaw of the Rhinoceros tichorkinus, allusion has been already 

 made to the traces of sockets of incisive teeth, observed in 

 the expanded symphysis of Siberian and British speci- 

 mens (p. 334). M. Christol has described and figured the 

 lower jaw of a tichorhine Rhinoceros,* discovered in the 

 post-pliocene marine deposits, (" les sables marins supe'- 

 rieures de Montpellier,") which, like the specimen de- 

 scribed by Pallas, -f- presented four alveoli at the symphysial 

 extremity ; the two outer or lateral cavities were two 

 inches deep, and one inch in diameter at the outlet : 

 the left socket contained the base of a fractured in- 

 cisor ; the two middle sockets were reduced to minute 

 circular pits, not exceeding three lines in depth, and 

 four in diameter. The last true molar is not quite in place, 

 and its anterior crescent is very little worn, indicating 

 that the individual with the above-described condition of 

 the lower incisors was scarcely full grown, certainly not an 



* Annales des Sciences Naturelles, 1835, torn. iv. pi. 2, fig. 1 and 2. The 

 second premolar (the first in the specimen figured by M. Christol) seems to me 

 to be proportionally too large, and too much advanced, for the species to which 

 this lower jaw is referred. 



t The words of Pallas are, " In apice maxillae inferioris, seu ipso margine, ut 

 ita dicam, incisorio, dentes quidem nulli adsunt ; verumtamen apparent vestigia 

 obliterata quatuor, alveolorum minusculomm aequidistantium, e quibus exteriores 

 duo, obsoletissimi, sed intermedii, satis insignibus fossis denotati sunt." Novi 

 Commentarii Petropol., t. xiii. p. 600. 



