nav i cell a

[Lat.. dim in. of nav is =a ship.] Zool.: A genus of Neritidæ, from fresh and brackish waters of countries bordering the Indian Ocean and the islands of the Pacific. The shell is oblong, smooth, patelliform, with a small columella sels; nautical skill. "Navarchy, and making models for buildings and rig gings of ships."-Petty: Advice to Hartlib , p. 6.