This species has a white body which is elaborately patterned with orange and purple spots especially on the dorsum. The size of the spots varies according to range, with those individuals in New Zealand having the largest. There is some variation in the patterning of this species.
The gills and rhinophores are crimson-white in color and both the rhinophores and the unbranched gills can be retracted into pockets. At the rear of the mantle there is a large concentration of mantle glands. This species reaches at least 60 mm in length