MERIAN ON THE ROCK-SALT IN SWITZERLAND. 13 



the * Jahrbuch,' 1837, rests only upon the fragment of an upper 

 molar, — Rh. Steinheimensis — according to Blainville this agrees some- 

 what with Uh. minutuSf and he refers its teeth to those of the Palee- 

 otheres and Lophiodons. Lastly, we must mention the Tapiroporcus, 

 which Jager estabhshed on the milk-teeth of the Rhinoceros. 



In the last ten years criticism has been as busy as species-making. 

 Owen's excellent work on the Fossil Mammalia of England threw 

 great light on Rh. tichorhinus and Rh. leptorhinus by his compre- 

 hensive description of these species. The Monography of the Rhino- 

 ceros, in Blainville' s great work on Mammalia, also appeared about 

 the same time. The result of three years' labour, with the help too 

 of a prodigious mass of material, does not satisfy this critical observer. 

 He points out the existence of two living species in Africa and of 

 three in Asia. Of the fossil species he regards as well established 

 the Rh. tichorhinus y Rh. leptorhinus, Rh. unicornis fossilis, and Rh. 

 incisivus, the males of which last species have been described, ac- 

 cording to the different conditions of age, as Rh. Goldfussi, Rh. 

 Schleiermacheri, Rh. Merki, Rh. minutus, and Rh. elatus ; and the 

 females of which have no horn. 



To the new species have been added in the course of the last ten 

 years Rh. tapirinus, by Pomel *, from the tertiary beds of the Puy 

 de Dome, and by Raulin, 1848, from the same place, Rh. hrachypus, 

 and Rh. tetradactylus from Sansan. 



The discovery of a very young lower jaw with the sockets of incisor- 

 teeth misled me into establishing a genus — Hysterotherium, which 

 I withdrew on obtaining a more perfect jaw, that enabled me to re- 

 cognize it as belonging to a young Rh. tichorhinus. The exhuma- 

 tion of nearly all the parts of a skeleton of the Rh. tichorhinus, nu- 

 merous specimens of various bones, as well as the skeleton from Nord- 

 hausen, now in the Museum of this place, has enabled me to examine 

 this species more particularly than had been hitherto done. But 

 Brandt's Memoir on the Rhinoceros tichorhinus, just commenced, in 

 the * Memoirs of the Petersburg Academy,' which will contain not 

 merely a richer mass of material, but indeed valuable information on 

 the soft parts, renders a more detailed account of my researches un- 

 necessary. 



[T. R. J.] 



On Borings in Search q/ Rock-salt, in Switzerland. 

 By P. Merian. 



[Bericht Verliandl. Naturf. Gesellsch. Basel, 1851, ix. pp. 41-44.] 



M. Kohly, Engineer, of Biel, who has been perseveringly engaged 

 for many years in the search for Rock-salt in the interior of the Jura, 

 has commenced boring at the village of Wysen, Canton Soleure, near 

 the Lower Hauenstein. 



Wysen stands on the great development of Muschelkalk which 

 composes the northern Jura, and which extends uninterruptedly from 



* Bulletin Soc. Geol. 1844. 

 vol. VIII. — part II, p 



