ACKNOWLEDGEMENTS

We would like to thank Mr. Mark Pankowski for the donation of the specimens to the USNM and Dr. Bob Purdy of USNM for facilitating the loan. We would also like to thank Prof. Mark Wilson, University of Alberta, for bringing the specimens to our attention. Finally, we thank Dr. Ken Johnson (Natural History Museum, London) for the loan of his protractor in order to measure the parasphenoid angle.