Indian, Tertiary, and, Tertiary, Vertebrata, Calcutta, Geological, Survey, Office, 1874-1902, India, Paleontology, Vertebrates, Fossil, This illustration showcases a series of detailed sketches of various fossilized teeth belonging to tertiary mammals. Each specimen is labeled with a number, organizing the display in a systematic manner for study and reference. The intricacies of each tooth's structure highlight the diversity of dental morphology among extinct species, providing insight into their dietary habits and evolutionary adaptations. The overall arrangement emphasizes the importance of these fossils in understanding mammalian evolution during the Tertiary period.