White-Tentacle Japanese Aeolis (Sakuraeolis Enosimensis)is a sea slug. One of the most characteristic features of the species are the brilliant opaque white spots and specks scattered over the head and cerata. Grows to 30mm or more.
Argonauta nodosa aka knobby or knobbed argonaut aka "paper nautilus" is a species of pelagic octopus. The female of the species, like all argonauts, creates a paper-thin eggcase that coils around the octopus much like the way a nautilus lives in its shell (hence the name paper nautilus).