1. Arvy, L. and R.F. Nigrelli: Studies on the biology of barnacles: parasites of Balanus eburneus and B. balanoides from N.Y. harbour and a review of the parasites and diseases of the Cirripedia. Zoologica N.Y. 54, 95?102 (1969)
2. Bellan-Santini, D.: Contribution à l'étude des peuplements infralittoraux sur substrat rocheux (étude qualitative et quantitative de la frange superieure). Recl Trav. Stn mar. Endoume 47 (63), 5?294 (1969)
3. Bock, S.: Papers from Dr. Th. Mortensen's Pacific Expedition 1914?1916. XXV. Planarians. Parts I?III. Vidensk. Meddr dansk. naturh. Foren. 79, 1?84 (1925a)
4. ?: Papers from Dr. Th. Mortensen's Pacific Expedition 1914?1916. XXVII. Planarians. Part IV-New stylochids. Vidensk. Meddr dansk. naturh. Foren. 79, 97?184 (1925b)
5. Boone, E.: Five new polyclads from the California coast. Ann. Mag. nat. Hist. (Ser. 10). 3, 33?46 (1929)