Fig. 2

A figure first printed in 1903 depicting the “classic” trends in horse evolution: increase in body size, reduction in number of toes, and increase in height of grinding teeth. A similar figure (although omitting body size) was drawn by O.C. Marsh for use in a lecture by T.H. Huxley in 1876. Representations of horse evolution in this linear manner can still be observed in many museums and textbooks, despite the fact that the history of this group and the trends that occurred in it are well-known to be far more complex (cf. MacFadden 1992). From Matthew (1903), also printed in Matthew (1926)