The Quarterly Journal of the Geological Society of London, v. 35 (1879), London, geology, periodicals, A series of detailed illustrations displaying various forms of bivalve shells, each meticulously numbered for identification. The shells vary in shape, size, and curvature, showcasing the diverse morphological features characteristic of the Carboniferous period. These representations highlight the smooth contours and distinct outlines of each specimen, emphasizing the intricate details that define their structure. Accompanying the illustrations is a title indicating 'Carboniferous Bairdii,' suggesting a focus on a specific group or type within the broader category of bivalves, possibly for scientific study or classification purposes.