Part 1. General Introduction. Part 2. Late Triassic Gastropods from Central Peru. Bulletin of the American Museum of Natural History: Volume 101, pp.I-XII, 1-328. B&W plates and drawings, fold out map and charts. Fine in original blue wrappers. Together with Part 3 [laid in]. Lower Jurassic Corals from the Arequipa Region. Novitates No. 1631, 1953. 14 pp. B&W photos. Fine in original wraps.