The original mouse from Englebart's SRI Augmentation Project was wheeled. Engelbart applied for a patent in 1967 and received it in 1970, for the wooden shell with two metal wheels (computer mouse – U.S. Patent 3,541,541), which he had developed with Bill English, his lead engineer, sometime before 1965. [Wikipedia]

Dick Lyon made one of the first optical mice while he was at Xerox PARC. His report on the project is a great read: http://www.dicklyon.com/tech/OMouse/OpticalMouse-Lyon.pdf

Dick Lyon made one of the first optical mice while he was at Xerox PA