* Cerberilla cf. incola Burn, 1974 Figure 17F, G

Material examined.

Two specimens 7-12 mm, TT.

Ecology.

Exclusively found in deeper soft sediment habitats outside coral reef habitats, where it exhibits an endo-benthic substrate preference. Depth 14-20 m.

Distribution.

Cerberilla incola is known from Australia (Burn 1974) and Réunion Island (Bachel 2010). First documented from the Gulf of Thailand by Chavanich et al. (2013).

Remarks.

Cerberilla incola as described by Burn (1974) represents a largely brown animal with dark brown rhinophores, dark brown lines across oral tentacles and along lateral and central lines of the dorsum with central cerata tipped with dark arrow-shaped marks. A later observation from near the type locality of South-East Australia (Cobb 2010) highlighted a light brown to nearly white specimen with pale blue lines along oral tentacles, a distinctive yellow-orange band along the anterior portion of the head, and with most cerata bearing parallel lines ranging from light to dark brown. A further observation from Réunion Island in the Indian Ocean (Bachel 2010) was also considered to be C. incola by Rudman (2010) bearing the same parallel lines along the cerata but lacking in the yellow-orange band of the earlier observation. All animals appear to have dark brown-grey rhinophores and the same dark colour anterior to the pericardium. Specimens from Koh Tao have been observed to show external variability (Fig. 17F, G) and further investigation is required.