Not to scare you any more, but S. latimanus does not have a definite "W" shape to the iris. The part surrounding the eye will appear yellowish.
See this link...
http://www.seadb.univpm.it/en_Broad-club-cuttlefish-Sepia-latimanus_497.htm
See this link...
http://www.seadb.univpm.it/en_Broad-club-cuttlefish-Sepia-latimanus_497.htm