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1824. 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 

 of the United States. Journ. Phil. Acad., V, pp. 119-131. 



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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 Part VI, April, 1834. 

 See Binney, complete writings. 

 Scharff, Robert F. 



1907. European Animals. 



1909. On the Evidences of a Former Land-bridge between Northern Europe 

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 Schuchert, Charles. 



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

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 Scudder, Newton Pratt. 



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

 Semper, Carl. 



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

 beiten aus dem Zoologisch-Zootomischen Institut in Wurzburg, I, 

 1874. 



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

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 Shaffer, David H. 



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. 



Trans. Lit. & Hist. Soc., Quebec, I, pp. 188-198. 

 Shick, Morris. 



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



133-140. April. 

 Shimek, B. 



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

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

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

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



p. 89, 

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



