110 THEORY OF THE EARTH. 



species already known, as to leave no doubts 

 whatever of their identity ; and the remaining six- 

 teen or eighteen have considerable traits of resem- 

 blance to known species, but the comparison of 

 these has not yet been made with so much preci- 

 sion as to remove all dubiety. 



Of the forty-nine new or hitherto unknown spe- 

 cies, twenty-seven are necessarily referable to 

 seven new genera; while the other twenty-two 

 new species belong to sixteen genera, or sub-gene- 

 ra, already known. The whole number of genera 

 and sub-genera to which the fossil remains of 

 quadrupeds hitherto investigated are referable, are 

 thirty-six, including those belonging both to known 

 and unknown species. 



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Of these seventy-eight species, fifteen which be- 

 long to eleven genera or sub-genera, are animals 

 belonging to the class of oviparous quadrupeds; 

 while the remaining sixty-three belong to the mam- 

 miferous class. Of these last, thirty-two species 

 are hoofed animals, not ruminant, and reducible to 

 ten genera ; twelve are ruminant animals, belong- 

 ing to two genera ; seven are gnawers, referable to 

 six genera ; eight are carnivorous quadrupeds, be- 

 longing to five genera ; two are toothless animals, 

 of the sloth genus ; and two are amphibious ani- 

 mals of two distinct genera.* 



* As the author has already referred fifteen other species to what 



