1958. Taxonomic significance of cloacal bursae in turtles. Trans. Kansas Acad. Sci., 61(1):86-98. SMITH, H. M., NIXON, C. M., and MINTON, S. A., JR. 1949. Observations on constancy of color and pattern in soft-shelled turtles. Trans. Kansas Acad. Sci., 56(1):92-98, 3 figs. SMITH, H. M., and TAYLOR, E. H. 1950. An annotated checklist and key to the reptiles of Mexico exclusive of the snakes. Bull. U. S. Nat. Mus., 199:v + 253. SMITH, M. A. 1930. The Reptilia and Amphibia of the Malay peninsula. A supplement to G. A. Boulenger's Reptilia and Batrachia, 1912. Bull. Raffles Mus., 3:xviii + 149 pp., 13 figs., April. 1931. The fauna of British India including Ceylon and Burma. Reptilia and Amphibia. Vol. I.--Loricata, Testudines. Taylor and Francis, London, xxviii + 185 pp., 2 pls., 42 figs., 1 map (frontispiece), March. SMITH, P. W. 1947. The reptiles and amphibians of eastern central Illinois. Bull. Chicago Acad. Sci., 8(2):21-40. SMITH, P. W., and LIST, J. C. 1955. Notes on Mississippi amphibians and reptiles. Amer. Midl. Nat., 53(1):115-25, January. SMITH, P. W., and MINTON, S. A., JR. 1957. A distributional summary of the herpetofauna of Indiana and Illinois. Amer. Midl. Nat., 58(2):341-51, 13 figs. SNEDECOR, G. W. 1956. Statistical methods. Iowa St. College Press, Ames, Iowa, 5th ed., xiii + 534 pp. STEBBINS, R. C. 1954. Amphibians and reptiles of western North America. McGraw-Hill Book Co., New York, vii + 528 pp., 104 pls., 52 figs. STEIN, H. A. 1954. Additional records of amphibians and reptiles in southern Illinois. Amer. Midl. Nat., 51(1):311-12. STEJNEGER, L. 1907. Herpetology of Japan and adjacent territory. Bull. U. S. Nat. Mus., 58:xx + 577 pp., 409 figs., 35 pls. 1944. Notes on the American soft-shell turtles, with special reference to _Amyda agassizii_. Bull. Mus. Comp. Zool., 94(1):1-75 pp., 30 pls., 10 tables, May. STEJNEGER, L., and BARBOUR, T. 1917. A check list of North American amphibians and reptiles. Harvard Univ. Press, Cambridge, Mass., 1st ed., iv + 125 pp. 1923. A check list of North American amphibians and reptiles. Harvard Univ. Press, Cambridge, Mass., 2d ed., x + 171 pp. 1933. A check list of North American amphibians and reptiles. Harvard Univ. Press, Cambridge, Mass., 3rd ed., xiv + 185 pp. 1939. A check list of North American amphibians and reptiles. Harvard Univ. Press, Cambridge, Mass., 4th ed., xvi + 207 pp.