Male of Ocythoe tuberculata Raf. (=Philonexis catenulatus, Fer.), Mediterranean, showing three stages, A, B, and C., in the development of the hectocotylus arm; h.cy, hectocotylus still in the cyst; c'y', spoon-shaped cyst at the end of the arm when freed; th, thread-like organ freed by the rupture of c'y'....
Argonauta hians, or the winged argonaut, also known as the muddy argonaut or brown paper nautilus, is a species of pelagic octopus. The common name comes from the grey to brown coloured shell.