Alosa
a genus of fishes, of the family clupeidæ. It contains two British species, the A. finta, or Twaite shad, and the A. communis, or allice shad. The shad resemble herrings in their form and structure, but are so much larger the mother. of herrings. The allice shad is rare in the Thames. The American species, clupea sapidissima, is abundant on the Atlantic coast. that they have been popularly called