This kinds of Majidae curb is Dr. Naoya Otsuchi (Ocean & Atomspher Research Institute Tokyo Univ.)'s subject. You can regest accurate identify for him.
As Dr. Garcia showed the species name, it is surely Herbstia condyliata (Fabricius, 1787) which is not uncommon in the Mediterranean Sea. Fine figures were published by Herst (1790, pl. 18 fig. 99), H. Milne Edwards (1834, pl. 8 fig. 5), Heller (1868, pl. 1 fig. 16), Pesta (1918, fig. 115), Bouvier (1940, fig. 205, pl. 13 fig. 7), Zariquiey Alvares (1946 fig. 172; 1968, fig. 153c, d), and others. M. Takeda (National Museum of Nature and Science, Tokyo)