4. A new snake of the genus Geophis from Chihuahua, Mexico. By John M. Legler. Pp. 327-334, 2 figures in text. January 28, 1959. 5. A new tortoise, genus Gopherus, from north-central Mexico. By John M. Legler. Pp. 335-343. April 24, 1959. 6. Fishes of Chautauqua, Cowley and Elk counties, Kansas. By Artie L. Metcalf. Pp. 345-400, 2 plates, 2 figures in text, 10 tables. May 6, 1959. 7. Fishes of the Big Blue River Basin, Kansas. By W. L. Minckley. Pp. 401-442, 2 plates, 4 figures in text, 5 tables. May 8, 1959. 8. Birds from Coahuila, Mexico. By Emil K. Urban. Pp. 443-516. August 1, 1959. 9. Description of a new softshell turtle from the southeastern United States. By Robert G. Webb. Pp. 517-525, 2 pls., 1 figure in text, August 14, 1959. 10. Natural history of the ornate box turtle, Terrapene ornata ornata Agassiz. By John M. Legler. Pp. 527-669, 16 pls., 29 figures in text. March 7, 1960. Index will follow. Vol. 12. 1. Functional morphology of three bats: Eumops, Myotis, Macrotus. By Terry A. Vaughan. Pp. 1-153, 4 plates, 24 figures in text, July 8, 1959. 2. The ancestry of modern Amphibia: a review of the evidence. By Theodore H. Eaton, Jr. Pp. 155-180, 10 figures in text. July 10, 1959. 3. The baculum in microtine rodents. By Sydney Anderson. Pp. 181-216, 49 figures in text. February 19, 1960. 4. A new order of fishlike Amphibia from the Pennsylvanian of Kansas. By Theodore H. Eaton, Jr., and Peggy Lou Stewart. Pp. 217-240, 12 figures in text. May 2, 1960. More numbers will appear in volume 12. Vol. 13. 1. Five natural hybrid combinations in minnows (Cyprinidae). By Frank B. Cross and W. L. Minckley. Pp. 1-18. June 1, 1960. 2. A distributional study of the amphibians of the isthmus of Tehuantepec, Mexico. By William E. Duellman. Pp. 19-72, pls. 1-8, 3 figs. August 16, 1960. More numbers will appear in volume 13. * * * * * Transcriber's Notes Page 26: Changed "19. Cosaleacaque" to "19. Cosoleacaque". Page 30: Changed "Brysonima crassifolia" to "Byrsonima crassifolia". Page 34: Changed "long. 95' 29 deg.;" to "long. 95 deg. 29';". Page 35: Changed "Matias Romera" to "Matias Romero". Page 47: Changed "kown" to "known". Pages 50 and 59: Changed "axills" to "axils". Plate 1, Fig. 2: Changed "Veracuz" to "Veracruz". Page 53: Changed "valadity" to "validity". Page 61, Table 1: Changed male symbol to "(Male)" (plain text version). Page 67: Changed "refering" to "referring". Page 68: Changed "survided" to "survived".