H. E.  Webster and Benedict, J. E., ?The Annelida Chaetopoda from Eastport, Maine?, Report of the U. S. Commissioner of Fish and Fisheries for 1885, pp. 707?758, 1887.

H. E.  Webster and Benedict, J. E., ?The Annelida Chaetopoda from Provincetown and Wellfleet, Mass.?, Report of the U. S. Commissioner of Fish and Fisheries for 1881, pp. 699?747, 1884.