Favorinus tsuruganus  Baba & Abe, 1964

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Favorinus tsuruganus is characterized by its opaque white body, and by the black rhinophores which have three 'cup-shaped' or 'collar-like' swellings. The cerata are translucent with a black tip, but digestive gland duct is orange, giving the species its distinctive colouration. It feeds like most species of Favorinus on the eggs of other sea-slugs. In most species of Favorinus depends the colour of the digestive glands on the colour of the eggs they have been eating. In Favorinus tsuruganus however, are the cerata consistently yellow-orange with a black tip.
More information on Favorinus tsuruganus are on Bill Rudman's Sea-Slug Forum!