Pp. xii, 250; numerous text-figures (cladograms and maps). Pictorial white stiff wrappers lettered in red and in black, sm 4to. "Cladistics" (=phylogenetic systematics) has emerged as a powerful analytical tool in comparative biology because it offers the most informative (least ambiguous) summations of any set of biological observations presented in a consistent, testable, reproducible framework" (from the rear cover). The volume contains 13 chapters by notable authorities on cladistics. No ownership marks.