Index to thk Nautilus 



Fossil Chitons. Vol. 30, No. 6, p. 71, 1916. 



Notes on the variation of Ischnochilon conspicuus. Vol. 31, No. 



2, p. 37, 1917. 

 List of shells collected at Anaheim Bay and vicinity. Vol. 31, 



No. 3, p. 103, 1918. 

 Chadwick, G. H. 



Notes on Polygyra appressa Say. Vol. 13, No. 5, p. 54, 1899. 

 An attempt to define the natural groups of Strombus. Vol. 13, 



No. 7, p. 76, 1899. 

 The natural groups of Strombus. Vol. 13, No. 8, p. 93, 1899. 

 List of Wisconsin shells. Vol. 19, No. 5, p. 57, 1905. 

 Shells of Prince Edward Island. Vol. 19, No. 9, p. 103, 1906. 

 List of Wisconsin shells. Vol. 20, No. 2, p. 22, 1906. 

 Clapp, George H. 



Vitrina limpida Gould in Pennsylvania. Vol. 7, No. 8, p. 94, 1893. 

 Variations due to station in Polygyra (Sfenotrema) hirsuta Say. 



Vol. 8, No. 2, p. 24, 1894. 

 Zonites cellarius in Western Pennsylvania. Vol. 8, No. 7, p. 82, 



1894. 

 Mollusks of Allegheny County, Pennsylvania. Vol. 8, No. 10, 



p. 116, 1895. 

 Dispersal of shells. Vol. 9, No. 3, p. 35, 1895. 

 Vitrina limpida in Western Pennsylvania. Vol. 9, No. 8, p. 94, 



1895. 

 Vallonia pulchella in Pittsburgh. Vol. 10, No. 12, p. 143, 1897. 

 Embryonic shells of Achatina crawfordi Melv. Vol. 11, No. 6, 



p. 69, 1897. 

 Selenites vancouverensis and Mesodon townsendiana at Duncan 



Island. Vol. 12, No. 2, p. 24, 1898. 

 Notes on two varieties of Pyramidula alternata Say. Vol. 13, 



No. 4, p. 41, 1899. 

 Shells collected at Oakdale, Morgan Co., Tennessee. Vol. 13, 



No. 6, p. 70, 1899. 

 Land Mollusca of Kennebunkport, Maine. Vol. 14, No. 6, p 



63, 1900. 

 Helix hortensis in Newfoundland. Vol. 14, No. 6, p. 72, 1900 

 An addition to the U. S. land snail fauna. Vol. 14, No. 11, p. 



130, 1901. 



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