College-level reference with fine illustrations. Of value for purposes of identification. Romer, A. S. (1945) Vertebrate paleontology, University of Chicago Press, Chicago. A college-level textbook with numerous illustrations. Shimer, H. W. (1933) Introduction to the study of fossils, The Macmillan Company, New York. A relatively simple college-level presentation of plant and animal fossils. Shimer, H. W., and Shrock, R. R. (1944) Index fossils of North America, John Wiley and Sons, New York. Comprehensive survey of the more common fossils of North America. Useful to the advanced collector and a most useful aid for fossil identification. Shrock, R. R., and Twenhofel, W. H. (1953) Principles of invertebrate paleontology, McGraw-Hill Book Co., New York. Useful college-level reference for advanced collectors. SELECTED REFERENCES ON TEXAS FOSSILS[2] *Adkins, W. S. (1920) The Weno and Pawpaw formations of the Texas Comanchean: Univ. Texas Bull. 1856. Descriptions and illustrations of many common Cretaceous fossils. *Adkins, W. S. (1928) Handbook of Texas Cretaceous fossils: Univ. Texas Bull. 2838. Lists all fossils described from the Texas Cretaceous prior to 1928, with many useful illustrations. *Adkins, W. S., and Winton, W. M. (1919) Paleontological correlation of the Fredericksburg and Washita formations of north-central Texas: Univ. Texas Bull. 1945. Contains descriptions and illustrations of many common Lower Cretaceous fossils of north-central Texas. Clarke, W. B., and Twitchell, M. W. (1915) The Mesozoic and Cenozoic Echinodermata of the United States: U. S. Geological Survey Monograph 54, Washington, D. C. A valuable guide to the Mesozoic and Cenozoic echinoderms of Texas. *Frizzell, D. L. (1954) Handbook of Cretaceous Foraminifera of Texas: Univ. Texas, Bureau Econ. Geol. Rept. Inves. No. 22. A technical, but invaluable aid in the study of Texas Cretaceous microfossils. *Girard, R. M. (1959) Bibliography and index of Texas geology, 1933-1950: Univ. Texas Pub. 5910. This valuable reference guide contains many references to Texas fossils. Note especially entries under Paleontology in the index. Heuer, Edward (1958) Comments on the nomenclature revision of the Strawn and Canyon megafossil plates, _in_ A guide to the Strawn and Canyon Series of the Pennsylvanian System in Palo Pinto County, Texas, An Occasional Publication of the North Texas Geological Society, Wichita Falls, Texas. Contains illustrations and latest name changes of many of the more common Pennsylvanian fossils of north Texas. *King, R. E. (1930) Geology of the Glass Mountains, Part II, Faunal summary and correlation of the Permian formations with description of Brachiopoda: Univ. Texas Bull. 3042. Contains descriptions and illustrations of numerous brachiopods from the Glass Mountains of Trans-Pecos Texas.