690 



some remarks on a peculiar subdivision in the septa towards the 

 outer wall of one side of the chambers, noticed by the author in 

 several specimens of Ormoceras, in an Orthoceras fi-om Russia, and 

 in Lituites; but he refrained from offering any opinion, whether 

 this character is common to the family of Orthoceratida, or is con- 

 fined to certain genera only. 



This being the last evening of the Session, the Society adjourned 

 to Wednesday, November the 7th. 



