Catalogue of marine Polyzoa. London, Printed by the order of the Trustees, 1852-1875, identification, catalogs, classification, bryozoa, cheilostomata, geographical distribution, cyclostomata, bryozoa, This illustration features two distinct sections showcasing details of the Calpidium ornatum. The first part displays a delicate, fern-like structure with intricate branching patterns. It emphasizes the fine lines and textures that characterize the species. Below, the second section presents a stylized representation of the cross-section of a calcareous structure, highlighting the unique, porous form and cavities typical of this organism. The design reflects precision in scientific illustration, aiming to convey both beauty and complexity of the natural world.