Why bother with collective mentality? -- Missteps on the road to macrocognition -- One step closer on the road to macrocognition -- A plausible foundation for macrocognition -- Is collective mentality intuitively implausible? -- The explanatory superfluity of collective mentality, part I -- The explanatory superfluity of collective mentality, part II -- Collective selves and collective personhood -- Different kinds of collective minds -- Conclusion.