nature of the UW and MSU brain collections
in process of being updated according to Mammal Species of the World
tree adapted from Valentine (Sci. Amer., 1978, pp. 140-158). Widths
of branches represent relative numbers of contemporary species.
Each letter next to branches represents one specimen in either
the Wisconsin (W) or Michigan State (S) collection.
Distribution of these letters shows the representative nature
of these collections for existing mammals.