J.B.D., Arthur’s Home Magazine, Philadelphie, T.S. Arthur & Sons, vol. 35-36, 1870, p. 228.
Another interesting aquatic larva, which may be included among crubs, is that of the caddis-fly. Living always in the water, it is remarkable for its fastening together by means of silken threads spun from its own mouth, small stones, bits of sticks, or small shells, thus constructing a sort of case which the soft parts of its body is protected, while the head and breast, which are harder in their nature, are alone protruded.