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1*24. Narrative of an Expedition to the Source of the St. Peter's River, 

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1825. Descriptions of Some New Species of Fresh-Water and Land Shells 

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1829. Descriptions of Some New Terrestrial and Fluviatile Shells of North 

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1831. Descriptions of Some New Terrestrial and Fluviatile Shells of North 

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1832-34. American Conchology; or, Descriptions of the Shells of North 

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1907. European Animals. 



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1905. Catalogue of the Type Specimens of Fossil Invertebrates in the De- 

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1885. The Published Writings of Isaac Lea, LL.D., Bull. U. S. Nat Mus., 23. 

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1874. Ueber die Wachsthums-Bedingungen des Lymnseus stagnalis. Ar- 

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1881. Animal Life as Affected by the Natural Conditions of Existence. In- 

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A Complete List of Land and Fresh Water Shells Found in the Imme- 

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 Sheppard, Mrs. 



1829. On the Recent Shells which Characterize Quebec and its Environs. 

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 Shick, Morris. 



1895. Mollusk Fauna of Philadelphia and Environs. Nautilus, VIII, pp. 

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 Shimek, B. 



1888. Notes on the Fossils of the Lcess at Iowa City, Iowa. Amer. Geol., 

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1890. The Mollusca of Eastern Iowa. Bull. Lab. Nat. Hist... Univ. low?, 

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1893, a. Additional Notes on Iowa Mollusca. Proc. Iowa Acad. Sci., I, pt. 

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1893, b. The Lcess and Its Fossils. Bull. Lab. Nat. Hist., Univ. Iowa, II, 

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1898. Is the Lcess of Aqueous Origin? Proc. Iowa Acad. Sci., V, pp. 32-45. 



