DARWIN, Charles (1809-1882). A Monograph of the Sub-Class Cirripedia. London: for the Ray Society, 1851-54. 2 volumes, 8°. 40 engraved plates by Sowerby, 3 hand-coloured or partly hand-coloured. Original purple cloth, decorated initials of the Ray Society stamped in gilt on upper covers, uncut (spines a little soiled and faded). Provenance: Quentin Keynes (1921-2003, Darwin's great-grandson; a gift to his doctor). FIRST EDITION. Freeman 339. (2)