Zool. [ad. mod.L. Cyclas, -adis the typical genus: see CYCLAS.] A mollusk of the genus Cyclas or family Cycladidæ, comprising numerous fresh-water species.
1866. Tate, Brit. Mollusks, ii. 36. The shell of this species [Cyclas lacustris] contrasts strongly with those of the other Cyclads, in its sub-rhombic form.
