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PALJSOSTOLOGY OF NEW YORK. 



The following American species of Orthoceras, Ormoceras, Actinoceras, 

 Enpoceras and Huronia, from Newfoundland, Canada, the island of Anticosti 

 and the United States, have been described and illustrated by M. Barrande 

 (Syst. Silurien du centre de la Boheme) : 



After a review of all the literature upon the Orthocerata, and a final revision 

 of the generic and subgeneric relations of Orthoceras, M. Barrande has pre- 

 sented the following tabular view in his Systlme Silurien du centre de la Bohhie. 

 I accept for the present this arrangement, hoping at some future time to be 

 able to prepare a revision of the Lower Silurian forms of Orthoceras, Endo- 

 ceras, etc., with better means of comparison and illustration than heretofore 

 possessed. 



