Indian, Tertiary, and, Tertiary, Vertebrata, Calcutta, Geological, Survey, Office, 1874-1902, India, paleontology, vertebrates, fossil, This illustration features two detailed drawings of vertebrae from tertiary era specimens. The upper vertebra is depicted with a focus on its bony structure, showcasing distinct contours and textures that highlight the anatomical features. The lower vertebra presents a similar emphasis on its form, emphasizing variations in shape that suggest functional adaptations. Both representations are meticulously rendered, providing insight into the morphological characteristics of these ancient creatures, accompanied by scientific labeling that indicates their significance in the study of vertebrate evolution.