def METHOD_NAME(self):
    """
    Note that we use a function to return the name of this species
    because we can't do it in the __init__ method due to it
    requiring that self.left_summand() and self.right_summand()
    already be unpickled.
    EXAMPLES::
        sage: P = species.PermutationSpecies()
        sage: F = P + P
        sage: F._name()
        'Sum of (Permutation species) and (Permutation species)'
    """
    return "Sum of (%s) and (%s)" % (self.left_summand(),
                                     self.right_summand())