‎Lea, I.‎
‎New Unionidae I-II (= Observations on the genus Unio VI-XII).‎

‎1857-1860 12 papers in two. Numerous text pages, 157 fine lithographed plates, royal 4to, new half cloth over marbled boards. Printed paper label on spine. One page with lower (blank) margin chipped, otherwise a very good set with very clean plates.Isaac Lea (1792-1886) was by far the most prolific 19th century American writer on fresh water molluscs. His American and other fresh water molluscan papers are numerous, diverse, and notoriously difficult to collate. The number of new species is sheer endless. The papers mainly come in three versions. (A). The original very short Latin descriptions in many small papers in the Proceedings of the Academy of Natural Science of Philadelphia (ANSP) (8vo size, without illustrations). (B). The expanded illustrated descriptions in the Journal of the ANSP (4to); C. The offprints of (B), with additional title pages, etc., titled ''Observations on'' (4to). The latter were combined, usually in pairs, into Volumes. There are 13 such volumes in all. Priority in many cases has not been established. All papers are listed and separately numbered in Scudder, the bibliographer of Lea. (Scudder 150, 170, 215, 222, 245, and 259).‎

Reference : ML25840

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