Wilson 1881. Report on the Pycnogonidae. Reports on the results of dredging, under the supervision of A. Agassiz, along the East Coast of the United States during the summer of 1880, by the United States Coast Survey steamer, 'Blake,' Commander, J. R. Bartlett, U. S. Navy. Bulletin of the Museum of Comparative Zoology, viii 1881: pp. 239-256