An extension of the integument of the body, or of the body
   wall, from which buds are developed, giving rise to new zooids, and
   thus forming a compound animal in which the zooids usually remain
   united by the stolons. Such stolons are often present in Anthozoa,
   Hydroidea, Bryozoa, and social ascidians. See Illust. under
   Scyphistoma.