Osteographie ou Description iconographique comparee du squelette et du système dentaire des Mammifères recents et fossiles Paris, J.B. Baillière et fils, 1839-1864. Henri Marie Ducrotay, An anatomical illustration depicting the skeletal structure of a marine mammal, showcasing the detailed arrangement of bones in the spine, skull, and limbs. The top section features a skeletal representation viewed from the side, highlighting the elongated vertebrae and rib cage, while the bottom section displays the forelimb structure, illustrating the adaptation for swimming. The drawing emphasizes the intricate connections between different skeletal components, contributing to the understanding of the species' anatomy and evolutionary adaptations.