Adult: Species description based on Taylor (1968) and Ibanez et al (1999). Adults to 620 mm. Dorsal: The body is olive grey or bluish grey. The head is lighter and more yellow than the body. A small, retractable tentacle is present just below the nostril. Ventral: The ventral surface is light yellow-grey or green-grey. The area of the vent is cream. Eye: The eyes are not visible in this species.