Three sorts

Thomas Best, The Art of Angling, Londres, B. et R. Crosby, 1814, p. 25-26.

Cod-Bait, Cad-Bait, Cadis-Bait, or Case-Worm, are thus differ ently called, and are of three sorts.1st. Found under stones that lie loose and hollow, in small brooks, shallow rivers, or very fine gravel, in case or husk, and when fit for use they are yellowish, are biger then a gentle, with a blackish head. Another sort is found in pits, ponds, ditches, in rushes, waterweeds, straw, &. Called ruff-coats, or straw-worms.