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Case, E. C.

1935. Description of a collection of associated skeletons of _Trimerorhachis_. Contrib. Mus. Pal. Univ. Michigan, 4:227-274.

Cope, E. D.

1889. The Batrachia of North America. Bull. U. S. Nat. Mus., 34:1-525.

de Beer, G. R.

1937. The development of the vertebrate skull. Pp. xxiii + 552.

Oxford, Clarendon Press.

de Villiers, C. G. S.

1934. Studies of the cranial anatomy of _Ascaphus truei_ Stejneger, the American "Liopelmid." Bull. Mus. Comp. Zool., 77:1-38.

Emelianov, S. W.

1936. Die Morphologie der Tetrapodenrippen. Zool. Jahrb. (Anat.), 62:173-274.

Francis, E. T. B.

1934. The anatomy of the salamander. Pp. xxxi + 381. Oxford, Clarendon Press.

Gamble, D. L.

1922. The morphology of the ribs and the transverse processes of _Necturus maculatus_. Jour. Morph., 36:537-566.

Gray, P.

1930. On the attachments of the Urodele rib to the vertebra and their homologies with the capitulum and tuberculum of the Amniote rib. Proc. Zool. Soc. London, 1930(1931):907-911.

Gregory, J. T.

1950. Tetrapods from the Pennsylvanian nodules from Mazon Creek, Illinois. Am. Jour. Sci., 248:833-873.

Hecht, M. E.

1957. A case of parallel evolution in salamanders. Proc. Zool.

Soc. Calcutta, Mookerjee Mem.:283-292.

Holmgren, N.

1933. On the origin of the tetrapod limb. Acta Zool., 14:185-295.

1939. Contributions to the question of the origin of the tetrapod limb. Acta Zool., 20:89-124.

1949a. Contributions to the question of the origin of tetrapods.

Acta Zool., 30:459-484.

1949b. On the tetrapod limb problem again. Acta Zool., 30:485-508.

Herre, W.

1935. Die Schwanzlurche der mitteleocanen (oberlutetischen) Braunkohle des Geiseltales und die Phylogenie der Urodelen unter Einschluss der fossilen Formen. Zoologica, 33:87, 1-5.

Jarvik, E.

1942. On the structure of the snout of Crossopterygians and lower gnathostomes in general. Zool. Bidrag fran Upsala, 21:235-675.

1952. On the fish-like tail in the Ichthyostegid Stegocephalians.

Meddelelser on Grnland, 114(12):1-90.

Mookerjee, H.K.

1930a. On the development of the vertebral column of the Urodela.

Phil. Trans. Roy. Soc. London, B 218:415-446.

1930b. On the development of the vertebral column of the Anura.

Philos. Trans. Royal Soc. London, B 219:165-196.

MacBride, E.W.

1932. Recent work on the development of the vertebral column.

Cambridge, Biol. Rev., 7:108-148.

McDowell, S.B.

1958. Are the frogs specialized seymouriamorphs? (Abstract) Anat.

Rec., 132(3):472.

Naef, A.

1929. Notizen zur Morphologie und Stammesgeschichte der Wirbeltiere. 15. Dreissig Thesen uber Wirbelsaule und Rippen, insbesondere bei den Tetrapoden. Zool. Jahrb., 50:581-600.

Noble, G. K.

1922. The phylogeny of the Salientia; I. The osteology and the thigh musculature; their bearing on classification and phylogeny.

Bull. Amer. Mus. Nat. Hist., 46:1-87.

1927. The value of life-history data in the study of the evolution of the Amphibia. Annals New York Acad. Sci., 30:31-128.

Piveteau, J.

1937. Un Amphibien du Trias inferieur. Essai sur l'origine et l'evolution des Amphibiens Anoures. Annales de Paleontologie, 26:135-176.

1955. Anoura. In: Traite de Paleontologie, 5:250-274. J. Piveteau, Masson et Cie, Paris.

Pusey, H. K.

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