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Ball, I. R. and T. B. Reynoldson 1981. British Planarians. Cambridge Univ. Press, London. 141 pp.

Ball, I. R. 1975a. Contributions to a revision of the marine triclads of North America: the monotypic genera Nexilis, Nesion, and Foviella (Turbellaria: Tricladida). Can. J. Zool. 53: 395-407.

Ball, I. R. 1976. Les caryotypes de trois planaires marines nord-américains: contribution à la phylognie et à la classification du groupe (Platyhelminthes, Turbellaria, Tricladida). Can. J. Zool. 54: 644-651.

Beneden, P. J. van 1860. Récherchesd sur la faune littorale de Belgique. Turbellariés. Mém. Acad. Sc. Belg. 32: 42-56.

Bock, S. 1925. Oersteds Planaria affinis wiederentdeckt. Zool. Anz. 64: 149-164.

Dalyell, J. G. 1853. The powers of the creator displayed in the creation. Vol. 2. John van Voorst, London. 359 pp.

Hyman, L. H. 1944. Marine Turbellaria from the Atlantic coast of North America. Am. Mus. Novit. 1266: 1-15.

Mereschkowsky, C. 1879. Über einige Turbellarien des Weissen Meeres. Arch. Naturg. Jahrg. 45, Bd.1: 53-54.

Oersted, A. S. 1843. Forsøg til en ny Classification af Planarierne (Planariea Dugès) grundet paa mikroskopisk- anatomiske Undersögelser. Naturh. Tidskr. Kjöbenhavn 4: 551- 554.

Steinböck, O. 1928. Beiträge zur Kenntnis der Turbellarienfauna Grönlands I. Bothrioplanidae und Tricladida. Medd. Grönland 74: 71-82.

Stimpson, 1857. Prodromus descriptionis animalium evetrebratorum quae in Expeditione ad Oceanum, Pacificum Septentrionalem a Republica Federata missa, Johanne Rodgers Duce, observavit et descripsit. Proc. Ac. Nat. Sci. Phil. 1857: 19-31.

Tomkiewicz, W. and I. R. Ball 1973. Uteriporus vulgaris Bergendal, 1890, a marine triclad new to North America. J. Fish. Board Can. 30: 464-466.

Verrill, A. E. 1873. In: A. E. Verrill and S. I. Smith, Report upon the Invertebrate Animals of Vineyard Sound and adjacent waters. Government Printing Office, Washington.

Foviella affinis