of Wirtemberg and Warwickshire. 5] 3 



from the Warwick sandstones ; but so far as I have hitherto had opportunities of 

 carrying on this investigation, the results, I trust, will be allowed to be decisive as 

 to the existence of reptiles in that formation which belong to the same natural 

 genus, as does one of the most peculiar and characteristic reptiles of the German 

 Keuper. 



So far, therefore, as the geological problem to which reference was made at the 

 beginning of the present paper, depends upon the determination of the correspond- 

 ence, in a pecuharly characteristic dental character, of the reptilian fossils of the 

 formations in question, the present researches must be regarded as decisive in 

 favour of the view entertained by Dr. Buckland of the identity of the Warwick and 

 Bromsgrove sandstones with the German Keuper. And if, on the one hand, geology 

 has thus really derived any essential aid from minute anatomy, on the other hand I 

 may venture to affirm, that in no instance has the comparative anatomist been 

 more indebted to geology than for the fossils which have revealed the most singular 

 and complicated modification of dental structure hitherto known ; and of which 

 not the slightest conception had been gained from investigation of the teeth of ex- 

 isting animals. 



