The electrical resistivity under hydrostatic pressure up to 1 .O GPa, Hall effect, magnetoresistance, and thermoelectric power are measured over the temperature range from 1.5 to 300 K for both, orthorhombic y-Mo,O,, and monoclinic q-Mo,O,, crystals with quasi-two-dimensional structures. All these properties show anomalies associated with the charge density wave (CDW) transition ; particularly the hydrostatic pressure enhances the CDW instabilities through the increased electron-phonon interaction and partial nesting of the Fermi surfaces. It is also found that both, electrons and holes contribute to the conduction processes, for which a qualitative discussion is made.

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