New fresh water shells of the United States : with coloured illustrations, and a monograph of the genus anculotus of Say; also a synopsis of the American naiades / By T.A. Conrad, member of the Acad. of Natural Sciences of Philadelphia
76, 8 pages, 9 leaves of plates : illustrations (lithographs) ; 20 cm
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Main vol. published in 1834 consists of 76 pages and 8 plates. Appendix, dated Oct. 1835, consists of 8 pages and 1 plate; appendix entitled: Additions to, and corrections of, the Catalogue of species of American Naiades, with descriptions of new species and varieties of fresh water shells.