Animals without Backbones:1 & 2 . 2 volumes. The story of the amoebas, sponges, corals, jellyfishes, worms of all kinds, starfishes, insects, and the variety of other invertebrates which make up 95 per cent of the animal kingdom. Sixty-four pages of illustrations.Market Paperback 1951 *Book Condition:prevowner's stamp,Good Pages are clean & free from markings. Binding is tight. Pages browning