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• The rustler bragged he'd absconded with five hundred head of longhorns.
    Both "head" and "longhorns" are parts of cattle that represent them as wholes.
• You've got to come take a look at my new set of wheels.
    Wheels, although only a part of a vehicle, refers to the whole car.
• "He shall think differently," the musketeer threatened, "when he feels the point of my steel."
    A sword, the species, is represented by referring to its genus, "steel."
  

A whole is represented by naming one of its parts - genus named for species, or vice versa - species named for genus.