I.L.B. 26 This monster is a cephalopod of the order Dibranchiata, and has eight flexible arms, each crowded with 120 pair of suckers, and two longer feelers about six feet in length, differing considerably from the others in form.    From Wordnik.com.  [The Hawaiian Archipelago] Reference

Dibranchiata, 74.    From Wordnik.com.  [On the Genesis of Species] Reference

But if we embrace this view, we must not forget that there are living Cephalopoda, such as the Octopods, which are devoid of any hard parts, whether external or internal, and which could leave behind them no fossil memorials of their existence, so that we must make a somewhat arbitrary assumption, namely, that at a remote era, no such Dibranchiata were in being, in order to avail ourselves of this argument in favour of progression.    From Wordnik.com.  [The Antiquity of Man] Reference