Indian Tertiary and post Tertiary Vertebrata, Calcutta, Geological Survey Office, 1874-1902, India, paleontology, vertebrates, fossil, This illustration features a detailed study of vertebrate skulls from the Tertiary period, showcasing various perspectives of a specific skull structure. The top view presents a clear outline of the cranial features, while the side profiles display intricate details of the jawline and dental structure. The intricate line work emphasizes the anatomical distinctions and evolutionary traits significant to this era, providing valuable insights into the morphology of extinct species. Labels and annotations may accompany the illustrations, offering further context on the specimens' classifications and anatomical characteristics.