We thank Ms. Diane Scott for drawing the reconstructions of the skulls. We sincerely thank all the curators and other personnel who lent us specimens for this study. The people include (in alphabetical order) Dr. David S Berman (Carnegie Museum), Dr. John R. Bolt (Field Museum of Natural History), Dr. Richard S. Laub (Buffalo Museum of Science), Dr. Robert Murphy (Royal Ontario Museum), Dr. Timothy B. Rowe (Texas Memorial Museum), Dr. B. Sanchiz, (National Museum of Natural Sciences, Madrid) Mr. C. R. Schaff (Museum of Comparative Zoology), and Mr. William F. Simpson (Field Museum of Natural History). We are grateful to Dr. Robert L. Carroll (Redpath Museum, McGill University) for sending us a manuscript of his unpublished phylogenetic study of choanates and some articles that were unavailable at Toronto. We thank Dr. D. Wake and Dr. M. Wake for reading the manuscript, for stimulating conversations on lissamphibian anatomy, and for letting one of us (M. L.) study the extensive collection of lissamphibian dried skeletons and cleared and stained specimens in the Museum of Vertebrate Zoology and in the Marvalee Wake Collection. Personal communications were obtained from David S Berman on Ecolsonia and from Mr. Michael deBraga on Procolophonidae. We thank Dr. J. Gauthier for stimulating conversations on systematics. We thank Dr. K. Padian for interesting conversations on systematics and for his hospitality. We also thank the staff of the document delivery and interlibrary loan services of the Erindale Campus (especially Mrs. Pamela King, Mrs. Andrea Pillo, and Mrs. Patricia Lai) for their help. We are indebted to Mr. Xu Jianping for translating parts of a Chinese article on hynobiid salamanders into English. This research was funded by Natural Sciences and Engineering Research Council of Canada (NSERC), Fonds pour la Formation de Chercheurs et l'Aide à la Recherche (FCAR), the Fondation Desjardins, the University of Toronto, and a grant to Robert R. Reisz. This is UCMP Contribution 1648.

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