Yes indeed, sigma octans! I have had a look at the digital map collection at the Australian National Library - just a glance. Very interesting for a look at how the southern sky has been represented in the past. Have a peek:
http://www.nla.gov.au/digicoll/
Erick, you are right about the aboriginal names for the stars as well as other cultures in similar latitudes.
This could really grow into a very big search couldn't it!
Richard