1. P. C. Sereno, H. C. E. Larsson, P. M. Magwene, C. A. Sidor, J. A. Wilson, Department of Organismal Biology and Anatomy, University of Chicago, 1027 East 57th Street, Chicago, IL 60637, USA.
2. D. B. Dutheil, 48 rue de la Rochefoucauld, 75009 Paris, France.
3. M. Iarochene, Ministère de l'Energie et des Mines, Rabat, Morocco.
4. G. H. Lyon, 3551 Carter Hill Road, Montgomery, AL 36111, USA.
5. D. J. Varricchio, Old Trail Museum, Post Office Box 919, Choteau, MT 59422, USA.