THEORY OF THE EARTH. 269 



They differ, however, from these latter, in ha- 

 ving the fore ones more simple, the backmost of all 

 with three necks, and the upper ones rhomboidal, 

 and marked with ridges very much resembling 

 those of the rhinoceros. 



We are still ignorant what the form of their 

 snout, and the number of their toes, may have been. 

 I have discovered not less than twelve species of 

 this genus, all in France, deposited in marly rocks 

 of fresh-water formation, and filled with lymnese 

 and planorbes, which are shells peculiar to pools 

 and marshes. 



The largest species is found near Orleans, in 

 the same quarry as the palseotheria ; it approaches 

 the rhinoceros. 



There is a smaller species in the same place ; a 

 third occurs at Montpellier ; a fourth near Laon ; 

 two near Buchsweiler in Alsace ; five near Ar- 

 genton in Berry ; and one of the three occurs 

 again near Issel, where there are also two others. 

 There is also a large one near Gannat *. 



These species differ from each other in size, the 

 smallest being scarcely so large as a lamb of three 

 months, and in various circumstances connected 



* See my Researches, vol. ii. part i. p, 177 and 218; vol. 

 iii, p. 394; and vol. iv. p. 498. 



