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On the Variation of the Shell of Pecten irradians Lamarck from Long 

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^ United States. Mark Anniversary Volume, article VI, 121, 1903. 



DiMON, Abigail C. 



Quantitative Study of the Effect of Environment upon the Forms ot 

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Say. Amer. Nat, XXXVI, 395, 1902. 

 Mayer, A. G. 



Some Species of Partula from Tahiti. A Study in Evolution. Mem. 

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The Chicago A( ^DExn 01 Sciences. 

 June 4, 1904. 



