Their siphon is small, and in the form of the stri of growth they resemble nautili.
nautili have a like range, and the shell of the liassic Loligo is similar to that of the “squid” of our own seas.
As far back as the Silurian we find the giant Orthoceratites contemporary with nautili, very like those of the present ocean.
The shell is very different from those of the other nautili in being much more deeply indented with circular striae.
The nautili live in rather shallow water usually creeping over the bottom feeding on small marine animals.
marine cephalopod, c.1600, from Latin nautilus, in Pliny a kind of marine snail (including also squid, cuttlefish, polyps, etc.), from Greek nautilos "paper nautilus," literally "sailor," from nautes "sailor," from naus "ship" (see naval). The cephalopod formerly was thought to use its webbed arms as sails.