2 literature references for Phorbas arneseni (Topsent, 1913):

Author: Van Soest, R.W.M.
Year: 2001
Title: Porifera, in: Costello, M.J. et al. (Ed.) (2001).
Source: European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50:
Author: Topsent, E.
Year: 1913
Title: Spongiaires provenant des campagnes scientifiques de la ‘Princesse Alice’ dans les Mers du Nord (1898-1899 - 1906-1907).
Source: Résultats des campagnes scientifiques accomplies par le Prince Albert I.Monaco 45: 1-67, pls I-V.