Spongiologische Beitrage, Leipzig, C.F. Winter'sche, 1892, sponges, A unique specimen of Ceratodendron Haeckelii, showcasing its intricate and organic structure. The formation resembles a natural sculpture, with textured surfaces and a distinctive, branching design that emphasizes the complexity of this organism. The piece exhibits a blend of natural forms, highlighting the elegance of biological structures in their raw form. The label beneath indicates its scientific classification, adding to its educational significance.