An Account of the Crustacea of Norway, Christiania, A. Cammermeyer, 1895-1928, crustacea, Norway, crustaceans, The illustration presents a detailed study of Isopoda, a subclass of crustaceans. It features various anatomical elements, including the segmented body structure, antennae, limbs, and claws of the organism Jlyarachna hirticeps as identified by G. O. Sars. Each part is labeled, showcasing distinct features such as the exoskeleton, compound eyes, and appendages. The precision in rendering highlights the complexity and diversity of isopod anatomy, providing a scientific reference for their morphology and classification.