188 



!'A I. .T- ONTOLOGY 



showing the development of a separate condyle on each ex- 

 occipital bone ; whence Professor Jaeger, recognizing the 

 identity of this structure with the batrachian character above 

 mentioned, founded upon the fossil a new genus of Batrachia 

 which he called " Salamandro'idcs gigantcus" Subsequent dis- 

 coveries, however, satisfied the Professor that the bi-condylous 

 fragment of skull, representing the genus Salamandroidcs, 

 belonged to the same reptile as the teeth on which he had 

 founded the genus Mastodonsaurus. The following fossils, 

 from the new red sandstone of "Warwickshire, gave additional 

 proof of the batrachoid nature of the genus to which those 



Transverse section of a tooth of the Labyrmthodon (magn.) 



fossils belong, with the establishment of five distinct species, 

 one of which is most probably identical with the Mastodon- 

 saurus salamandro'idcs of Professor Jaeger. In reference to 

 the generic denomination Mastodonsaurus, it unavoidably re- 

 calls the idea of the mammalian genus Mastodon, or else a mam- 



