Proceedings of the Zoological Society of London, London, Academic Press Periodicals, Zoology, This illustration showcases various species of echinoderms, specifically highlighting representatives from the genera Lytechinus and Tarechinus. Each specimen is meticulously labeled with letters corresponding to their specific features. The detailed outlines and surface textures emphasize the unique shapes and characteristics of each echinoderm, showcasing their intricate structures. The various angles provide a comprehensive view of their morphology, making it a valuable resource for understanding the diversity within this class of marine animals.