Proceedings of the Zoological Society of London London, Academic Press, 1833-1965 periodicals, zoology, The illustration features a series of detailed diagrams depicting various tests of the family Temnopleuridae, commonly known as sea urchins. Each figure showcases distinct structural characteristics of these echinoderms, highlighting the unique patterns and forms of their exoskeletons. - **Figure 1** presents a three-dimensional view of a typical test, emphasizing its rounded, dome-like shape. - **Figure 2** illustrates a more flattened specimen, showcasing the intricate surface details. - **Figure 3** features a close-up of a test's outline, highlighting the radial symmetry. - **Figures 4, 5, 6, and 7** provide additional perspectives and variations,