London, Sidgwick & Jackson, 1969. First Edition. First Impression. Hardback. A near fine copy. Published earlier in wraps in 1961 in the US under 'Creatures of the Abyss'. A slight reading lean, some spotting to the top edge, 4mm short tear to jacket on foreedge, some bleeding to jacket interior. Price and ink mark to front endpaper. [7993, Hyraxia Books].