First edition. Five volumes (complete).
London: by order of the Trustees of the British Museum, 1903-1940.
Quarto, navy blue cloth stamped and lettered in gilt. Corners and spine ends rubbed, and some bumped, covers a bit scuffed, cloth in spine channels split in four volumes, some endpapers cracked over hinges.
A catalogue of one of the world's finest collections on natural history. Not just a checklist, but often containing information on contents.