Manuel d'actinologie ou de zoophytologie, Paris, F.G. Levrault, 1834-1836, corals, sea anemones, cnidaria, ctenophora, The illustration showcases various species of echinoderms, specifically focusing on different types of sea urchins. Each specimen is meticulously detailed, highlighting their distinct anatomical features. The top section includes rounded and orbicular forms, labeled as 1 (PLACENTULA rondache) and 2 (LAGANE orbiculaire), respectively. Below these, numbers 3 and 4 represent other forms, demonstrating variations in structure and texture. The meticulous arrangement emphasizes the diversity within these marine organisms, showcasing their unique designs and patterns, which are essential for understanding their ecological roles. The intricate designs of the shells reflect the natural beauty and complexity of sea life.