REMARKS ON 



CLASSIFICATIONS OF NORTH AMERICAN 

 HELICES 



BY EUROPEAN AUTHORS, 



AND ESPECIALLY BY 



H. & A. ADAMS AND ALBEES. 



By Thomas Bland. 



Bead October 12th, 1863. 

 Eeprinted from the Annals of the Lyceum of Natural History, New York, Vol. vili. Oct. 1863. 



1^0 classification or arrangement of Terrestrial Mollnsks, 

 embracing the numerous Genera and Sub-genera proposed by 

 European authors, has at present been attempted or discussed 

 by American Conchologists. 



In this paper I propose to give particulars of, and observa- 

 tions especially upon the classifications* by H. & A. Adams, 

 {Genera of decent Mollusca^ II., London^ 1855), and by Albers, 

 {Die Heliceen^ Lei^sic^ 1860, 2d Ed.^ ly Yon Martens), of the 

 species of Helix which inhabit ITorth America, exclusive of the 

 Pacific Coast and Mexico. 



* It is to be regretted that the first parts only of Gray's Catalogue of Pulmo- 

 nata, London, 1855, and Guide to the Systematic Distribution of MoUusca, 

 London, 185Y, issued from the British Museum, have at present been published. 



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