Errantia

Errantia, a sub-order of worms belonging to the Polychaeta (q.v.), and including all those members of this order which are free and carnivorous; in the second sub-order, or Tubicola, the worms all live in tubes and are vegetarians. The principal families included in this sub-order are the Sea mice (Aphroditidee) and the Nereids (Nereidce).