By W. G. Binney and T. Bland. Published in Smithsonian Miscellaneous 

 Collections, Nos. 194, 143, and 144. 1865 to 1869. Part IV., on the 

 Strepomatidee. By George W. Tryon, Jr., No. 253. 1873. 



" Monograph of American Corbiculidoe, recent and fossil. By Temple 

 Prime. Smithsonian Miscellaneous Publications, No. 145. 1865. 



" This pamphlet contains descriptions and illustrations of the small 

 bivales, Sphserrum, Pisidium, etc. 



" The best general work on American land shells is 



"A Manual of American Land Shells. By W. G. Binney. Published 

 as Bulletin No. 28 of the United States National Museum. 1885. 



^ The most elaborate and modern account of the land shells is 

 found in 



"A Guide to the Study of Helices. By Henry A. Pilsbry. Pub- 

 lished by the Couchological Section of the Philadelphia Academy 

 of Sciences. 1894. 



'"Many valuable papers by the same author will be found in the 

 Proceedings of the Philadelphia Academy from 1890 to the present year. 



" A volume containing many beautifully colored figures is 



"Monograph of the Fresh-water Univalve Mollusca of the United 

 States. By S. S. Haldeman. Philadelphia, 1840-44. Continuation by 

 Geo. W. Tryon, Jr. Philadelphia. 1870. 



" A volume devoted to the land and fresh-water shells of the Upper 

 Mississippi Valley is 



"The Mollusca of the Chicago Area. By Frank C. Baker. Pub- 

 lished by the Chicago Academy of Sciences. 1902. 



" This work contains many illustrations of the common species. 



" The fresh-water clams, or Unios, have been carefully described 

 and figured in 



" Observations on the Genus Unid. By Isaac Lea. Thirteen vol- 

 umes. 1834-1874. Philadelphia, Pennsylvania. 



" These mollusks are catalogued and classified in a modern man- 

 ner in 



"A Synopsis of the Naiades; or, Pearly Fresh-water Mussels. By 

 Charles T. Simpson. Published in the Proceedings of the United States 

 National Museum, Volume XXII., pp. 501-1044. 1900. 



" An excellent account of the pearl button industry will be found 

 in Volume XVIII. of the United States Fish Commission; and the eco- 

 nomic uses of mollusks are interestingly told in 



" Etho - Conchology : A Study of Primitive Money. By Robert 

 E. C. Stearns. Published in the Annual Report of the Smithsonian 

 Institution. 1887. Part II., p. 297. 



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