1883 222 p., 8 (1 col. fig.) lithographed plates, 2 col. maps, 14 folded tables, roy. 4to, black cloth, gilt author/title on spine. Published in: Nova Acta. Abh. der Kaiserl. Leop.-Carol. Deutschen Akademie der Naturforscher. Good and well bound copy.Although dealing with all land and freshwater molluscs, the fine plates all depict Unionidae. Bound in is a neatly written dedication leaf dated 1888 from German students to their teacher.From the Library of Richard I. Johnson (1925-2020), malacologist and bibliophile, who build over a period of nearly six decades, what was perhaps the largest private library of books and journals on molluscs.