Totemism

Is there any human institution which can be safely called "Totemism"? Is there any possibility of defining, or even describing Totemism? Is it legitimate-is it even possible, with due regard for "methodology" and logic-to seek for the "normal" form of Totemism, and to trace it through many Protean changes, produced by various causes, social and speculative? I think it possible to discern the main type of Totemism, and to account for divergences.