The Greeks had lyres of various kinds, more or less differing in construction, form, and size, and distinguished by different names; such as lyra, 30kithara, chelys, phorminx, etc. Lyra appears to have implied instruments of this class in general, and also the lyre with a body oval at the base and held upon the lap or in the arms of the performer; while the kithara had a square base and was held against the breast. These distinctions have, however, not been satisfactorily ascertained. The chelys was a small lyre with the body made of the shell of a tortoise, or of wood in imitation of the tortoise. The phorminx was a large lyre; and, like the kithara, was used at an early period singly, for accompanying recitations. It is recorded that the kithara was employed for solo performances as early as B.C. 700.