A triangular shape

Inez N. MacFeeLives of Busy Neighbor, New York, Stoke, 1924. p. 71. http://babel.hathitrust.org

Different members of the caddis tribe of course, make different shapes and kinds of baskets. Some builf flat baskets, another kind prefers a triangular shape, the least common ones of all fashion a silken horn, which is large at one end and pointed at the other. Not a few of them decorate their boats with tiny snail shells, and to their thinking the camouflage is much more complete if the shells have living inhabitants. The simplest baskets are those made by the caddis-worms which love in swiftlymoving streams : these are simply a fex pebbles and sticks fastened