Nouvelles annales du Muséum d'histoire naturelle, Paris, Roret, natural history, periodicals, The illustration displays a series of detailed anatomical sketches of various skulls, each labeled with figure numbers (Fig. 3, Fig. 4, Fig. 5, Fig. 6). The top section presents a more complete view of a skull, while the subsequent figures provide differing perspectives or fragments of the skull structure. This educational depiction emphasizes the complexity and variation in skull anatomy, likely intended for scientific study or classification purposes, showcasing the intricate details of cranial features and their relevance to understanding species differences. The subtle background elements may suggest an aged or historical context for the scientific work represented.