A cephalopod of the genus
Sepia, having an internal shell, large eyes, and ten arms furnished with denticulated suckers, by means of which it secures its prey. The name is sometimes applied to dibranchiate cephalopods generally. [
1913 Webster]
" It has an ink bag, opening into the siphon, from which, when pursued, it throws out a dark liquid that clouds the water, enabling it to escape observation."
[1913 Webster]