London: Printed for the Ray Society 1859. First Edition. Folio, pp. [viii]-x + 143 + blank + ff  + blank; dull green library linen boards with gilt lettering on spine; boards lightly soiled and rubbed; call numbers stamped to heel of spine; library bookplate to pastedown with "Discard" stamp; four-inch tear to fore-edge of half-title leaf; embossed library stamp and pencil annotations to title leaf; embossed library stamp to p. 1; library tickets and pockets to rear endpapers; cellotape repair to top edge of last plate; else a sound, ex-library copy. Illustrated with twelve uncolored lithograph plates and accompanying letterpress descriptive text. Good. Cloth. 
While serving as ship's surgeon aboard the H.M.S. Rattlesnake, Huxley (1825-1895) collected and studied specimens of hydrozoas in the waters off Australia, New Guinea, and Palermo, Italy. Through careful dissections and close observation of physical relationships, Huxley succeeded in bringing more detailed order to the knowledge of these minute organisms.