592 NKW YORK STATE MISEUM 



marks of the j^eroutic or senile age have not been observed in 

 these colonies. 



There is no doubt that to these ontogenetic stages of the 

 livdrosonie of Goniograptiis there are corresponding phyloge- 

 netic stages in llie evolution of the genus, though the forms 

 leading uj) to Goniograptus and to the preceding multiramose 

 <lichogratids are not known, the latter appearing unannounced 

 in the Cambric. 



Parallel series of growth stages of other multiramose dicho- 

 ^'raptids have been obtained in the Tetragraptus and 

 1) i d y m o g r a p t u s b i f i d u s beds of the Deep kill section. 

 As they sc^rve more to verify the observations made on G o n i o - 

 ^ r a p t u s t li u r e a u i than to bring out new facts, their 

 -description has been deemed unnecessary in this preliminary 

 publication. 



