Faune du calcaire carbonifère de la Belgique Bruxelles, F. Hayez, impr, 1878-87. Belgium, Brachiopod, Fossil, Carboniferous, Fishes, Fossil, Mollusks, Fossil, Paleontology, Fossils, Sea, Ocean, Shells, This collection features a series of detailed illustrations showcasing a variety of shell shapes and forms. Each shell is carefully labeled and displayed in a systematic arrangement, highlighting the diversity of marine life. The specimens include smooth, ridged, and intricately patterned shells, ranging from small to larger sizes, with varying silhouettes such as conical, rounded, and elongated shapes. This visual study serves as a resource for understanding the classification and anatomical features of different mollusk species.