The composition features a collection of intricately detailed illustrations of echinoderms, specifically focusing on various types of sea urchins. The top section displays two distinct forms: one resembling a delicate, spiky sphere and another characterized by a more rounded, smooth surface, both showcasing the unique structures on their shells. Below, a series of scientific drawings highlight the morphological variations among the species, with examples of surface textures and patterns visible. The use of color emphasizes certain features, particularly enhancing the visual appeal of the orange and red specimens. This collection serves as a scientific exploration of marine life, emphasizing the beauty and diversity found within the underwater ecosystem.