The energy and mass distributions and their correlations have been studied for the spontaneous fission of 242Pu and 244Pu and for the thermal-neutron induced fission of 241Pu. A comparison of the 242Pu(s.f.) and the 241Pu(n th, f) results shows a narrower mass distribution, a much higher peak yield and a more pronounced fine structure for the spontaneous fission than for the neutron induced fission. The average total kinetic energy is higher for 242Pu(s.f.) than for 241Pu(n th, f), and also the energy-mass correlations behave differently in both cases. The 244Pu(s.f.) data are very similar to these for 242Pu(s.f.). All these results are discussed and interpreted in the frame of the scission point model of Wilkins et al.