TABLE OF PALEOZOIC AMMONOIDS. 



23 



vation and relationship of tiie various groups. It is subject to revision 

 or niodiiication by any new discovery of forms, or any studies in the 

 ontogeny of groujjs of wliich tlie ontogeny is at present unknown. It is 

 not claimed that it is an absolute phylogenic classification; it is merely an 

 attempt at such a classification. The writer has followed strictly the 

 classifications of other investigators where he had no new ol:)servations of 

 his own to offer; he has departed from the accepted classification in 

 the construction of the phylogenic table of the Paleozoic ammouoids only 

 where ontogenic study of the various groups makes such changes necessary. 



Table of Paleozoic ammortoid genera. 



