London, The Zoological Society of London, 1863. Folio (32.5 x 25.5 cm). 45 pp.; 18 text engravings, four fine, lithographed plates. Later blind wrappers.
A fine monograph, of great importance to the higher systematics of the group, and with the first, very beautiful illustrations of some species described earlier by Gray only in a very short form, and without illustrations. The excellent plates are by G. H. Ford. Published in the Society's Transactions. Rare. Nissen ZBI, 1698.