Acknowledgments
The author is most grateful to the riders who provided the feedback on which the questionnaire is based.He is indebted also to the curators of the Smithsonian Museum, Washington, DC, the Field Museum, Chicago, the Museum of Comparative Zoology, Harvard University, and the Peabody Museum, Yale University for granting him access to their collection of equidae skulls.Figure 2 was drawn with the help of anatomical specimens provided by Dr. M. Kumar, Tufts University and tomograms provided by Dr. Ross Tucker, Washington State University.

Professor of Surgery Emeritus, Tufts University School of Veterinary Medicine.USA

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