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 (ynanatus) 

 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 

 phoccB 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 



* S^^vpotX, a lizard. 



