This beautiful little nudibranch is fairly rare, but all individuals seen here were documented in water between 2 and 3 metres and found on relatively exposed rocky reefs or near a broken shoreline.  Their unbroken white stripe mid-notum is generally what distinguishes them from the similar (but elusive to me)  Verconia varians.  Look closely, however, and you’ll see that one of these individuals has a slightly broken mid-line. Its orange-tipped gills and rhinophores confirmed its identification.   Sea Slugs of Hawaii has some great images of small groups gathered on food sponges.  Grows to less than 1″ or 21 mm.  The pair documented below were approximately 12 mm.