Cuttlefish
a genus and family of cephalopodous mollusks of the order Dibranchiata. The body is oblong and depressed, sack-like, with two narrow lateral fins of similar substance with the mantle; the whole shell is light and porous. The eyes are very large, and the head is furnished with eight arms, each of which has four rows of suckers and two long tentacles expanded and furnished with suckers on one side at the extremity.