Biologia Centrali-Americana London, 1879-1915, archaeology, botany, Central America, description and travel, scientific expeditions, zoology, 28, shells, mollusc, This illustration showcases various views and anatomical details of the Uni semiornatus, a type of bivalve mollusk. Each figure presents different angles of the shell, highlighting its distinctively ridged surface and symmetrical shape. The accompanying labeled drawings depict internal features, offering insights into its biological structure. The clear delineation between the diverse perspectives emphasizes the unique characteristics of this species, contributing to an overall understanding of its form and functions within its habitat.