Malacozoaires, ou, Animaux mollusques, A Paris, Chez F.-G. Levrault, 1828-1830, France, mollusks, classification, A scientific illustration displaying various species of mollusks, specifically focusing on a collection of Siphonobranchs. The composition features detailed representations of different shell types, labeled with numbers and accompanied by descriptive terms such as 'Porcelaine' and 'Ovale.' Each specimen is showcased with distinct coloration and anatomical features, highlighting the diversity within this group. The arrangement is methodical, emphasizing a taxonomy or classification system, typical of 19th-century natural history studies. The bottom portion includes a caption with measurement indications and additional notes on each species.