The Collaborative International Dictionary of English v.0.48:

Lant \Lant\, n. [Cf. Lance.] (Zool.)
   Any one of several species of small, slender, marine fishes
   of the genus Ammedytes. The common European species
   (Ammedytes tobianus) and the American species (Ammedytes
   Americanus) live on sandy shores, buried in the sand, and
   are caught in large quantities for bait. Called also
   launce, and sand eel.
   [1913 Webster]