320 RHINOCEROS. 



Rhinoc. incishms of Cuvier, but distinct from Rhinoc. ti- 

 chorhinus and from the supposed Rhinoc. leptorhinus. 



7. 1838. Rhinoceros primigenius, proposed by Bronn, in the ' Lethtea 



Geognostica,' to include the Rhinoc. tichorhinus and 

 Rhinoc. leptorhinus of Cuvier, in conformity with the 

 views of Christol. 



8. 1839. Rhinoceros Merckii (syn. Rhinoc. Kirchbergense, Jag.) pro- 



posed by Jager (1839), and by Kaup (1841), as a distinct 

 form. 



9. 1842. Rhinoceros de Filippi, proposed by Balsamo Crivelli, for 



remains occurring in the Lignite of LefTe (Gandino) as 

 distinct alike from Rhinoc. tichorhinus and Rhinoc. lepto- 

 rhinus. 



10. 1846. Rhinoceros leptorhinus of Cuvier, reproduced by Owen 



upon British fossil specimens, but invested with a bony 

 septum, and Rhinoc. Merckii identified with it ; Rhinoc. 

 megarhinus or R. Schleiermacheri, held to be distinct. 



11. 1847. Rhinoc. leptorhinus admitted by De Blainville, as with or 



ivithout a bony nasal septum ; Rhinoc. megarhinus com- 

 bined with it ; but Rhinoc. Merckii transferred to Rhinoc. 

 incisivus. 



12. 1849. Rhinoc. leptorhinus of Cuvier, accepted by Laurillard, in 



the view of Owen, as having a bony septum; Rhinoc. me- 

 garhinus of De Christol held to be distinct. 



13. 1849. The Rhinoceros leptorhinus of Cuvier accepted by Brandt, 



but the Rhinoc. leptorhinus of Owen identified with 

 Rhinoc. tichorhinus (!). 



14. 1852. Undecided opinions entertained by Gervais, who adopts the 



Rhinoc. megarhinus of De Christol, and leans to the view 

 that the Rhinoc. leptorhinus of Cuvier, founded on Cor- 

 tesi's cranium, and of Owen, are of the same species; but 

 that the Rhinoceros remains of the Velay (Rhinoc. elatus, 

 Cuv.) and of the Val d'Arno belong to another distinct 

 form. 



15. 1854. Rhinoc. leptorhinus, adopted by Pomel, in the view of 



Owen, as having a bony septum, under the name of Atelo- 

 dus leptorhinus ; and another species, besides Rhinoc. 

 tichorhinus, proposed under the name of Atelodus Aymardi, 

 as also having a bony septum ; the Rhinoc. elatus of 

 Croizet, identified with Rhinoc. megarhinus, under Atelodus 

 elatus. 



16. 1854. The Rhinoceros leptorhinus of Cuvier, reproduced by 



Duvernoy as destitute of a bony septum ; Rhinoc. mega- 

 rhinus identified with it ; and the Rhinoc. leptorhinus of 

 Owen erected into Rhinoc. protichorhinus. 



The above table suggests a grave and instructive comment 

 on tbe uncertainty of palseontological determinations, even 

 when guaranteed by names of the highest authority. The 

 point upon which hinged the discussion, protracted during 

 upwards of twenty years, was, ' Had Rhinoc. leptorhinus an 

 osseous nasal septum, or had it not ? ' The pendulum oscil- 



