283 



from its adherent matrix, appears to have been obtained 

 from the London clay. A tooth, apparently of some species 

 of this family, is imbedded in grey limestone from near Bath. 



Amphibia. Fossil bones of the lamantin (inanatus) 

 have been dug up on the sides of the river Layon, to the 

 south of the Loire, in a calcareous bed formed of fossil 

 shells ; they were accompanied by other bones, belonging to 

 phocce and cetacea. Among these were fossil bones, deter- 

 minately belonging to a manatus, but different from any 

 known species. Some of these bones were the bones of a 

 seal, twice and a half as large as those of the common seal, 

 P. vitulina. 



No decided remains of the trichecus rosmarus, or walruss, 

 have been found ; though several fossils have been supposed 

 to belong to this animal. 



Sauri.* We have been taught by the instructive labours 

 of the illustrious Cuvier, to whom science is so much in- 

 debted, that not only the external characters which dis- 

 tinguish the several subgenera and species of existing 

 crocodiles, but also those characters observable in the 

 skeleton, by which the kind and degrees of accordance be- 

 tween the existing and fossil animals of this genus may be 

 ascertained ; and which also serve as points of comparison 

 between the genus crocodile and those fossil saurian remains 

 which demand to be placed under other genera. 



Crocodile. A saurian reptile, characterized by conical 

 teeth disposed in a single row ; a broad tongue not exten- 

 sible ; a tail flattened on its sides ; the hind feet palmated, 

 or semipalmated ; with scales, nearly square on the back, 

 belly, and tail. Besides these more general and compre- 

 hensive characters, the following have also been found in 



, a lizard. 



