146 ON THE REVOLUTIONS OF 



This extraordinary species, comparable to no species now exibting, 

 is subdivided into three sub-genera. The anoplotheria, properly so 

 called, the anterior grinders of which are still tolerably thick, and the 

 posterior of the lower jaw have a plane ridge in the crescent. The 

 xiphodons, whose anterior grinders are thin and cutting, and whose 

 posterior in the lower jaw have, immediately opposite to the concavity 

 of each of their crescents, a point which by use assumes the form of the 

 crescent, so that there the crescents are double, as in ruminating 

 animals. The dichobunes, whose exterior crescents are also pointed at 

 the beginning, and which thus have points arranged in pairs on the 

 back grinders of the lower jaw. 



The anoplotheria, the most common in our gypsum-quarries (A. com- 

 mune), is an animal as tall as a wild boar, but much larger, and with a 

 very long and very thick tail, so that as a whole it has nearly the pro- 

 perties of the otter, but much larger. It is probable that it swam well 

 and frequented lakes, at the bottom of which the bones have become 

 incrusted by gypseous deposites. We have one smaller species, but 

 otherwise quite similar (An. secundariuni) . 



We have as yet found only one xiphodon, a very remarkable animal, 

 which I have named An. gracile. It is slender and slightly formed, like 

 the most beautiful gazelle. 



There is one dichobwie, nearly the size of a hare, which I call An. 

 leporinum. 



In addition to its sub-generic characteristics, it differs from the ano- 

 plotheria and xiphodons by having two small and slender toes on 

 each foot on the sides of the two large toes. 



We are not aware whether these lateral toes existed in the two other 

 dichobunes, which are small, and scarcely exceed the Guinea pig in 

 size. 



The genus of anihracotheria is nearly the medium between the 

 pala^otheria, the anoplotheria, and hogs. I have thus named it, be- 

 cause two of its species have been found in the lignites of Cadibona, 

 near Savone. The first was nearly as large as the rhinoceros; the se- 

 cond was smaller. They are also found in Alsace and Velay. Their 

 grinders are similar to those of the anoplotheiia, but they have project- 

 ing canine teeth. 



The genus cheropotamns is found in our gypsum quarries, together 

 with the palaeotheria and anoplotheria, but itis much more rare. The back 

 grinders are square at top, rectangular at bottom, and have four large 

 conical projections, sin rounded by some smaller. The front grinders 

 are short cones, slightly compressed, with double roots ; its canine teeth 



