Maurice Goldsmith Mehl was an American paleontologist and professor in the Department of Geology at the University of Missouri.
A skull of M. andersoni
Samuel Wendell Williston was an American educator, entomologist, and paleontologist who was the first to propose that birds developed flight cursorially, rather than arboreally. He was a specialist on the flies, Diptera.
Samuel Wendell Williston
Williston in 1891
Image: Cambrian Trilobite Olenoides Mt. Stephen
Image: FMIB 35665 Common Crayfish (Astacus fluviatilis, Male) (cropped)