CEPHALOPODS.
- Beak of Octopus.
- Pearly Nautilus. Nautilus umbilicatus (New Caledonia). = crusty nautilus (Allonautilus scrobiculatus)
- Paper Nautilus. Argonauta tuberculata (Indian Ocean). = knobbed argonaut (Argonauta nodosa)

Title: Nature neighbors, embracing birds, plants, animals, minerals, in natural colors by color photography,
Author: Nathaniel Moore Banta, 1867- ; Gerard Alan Abbott; William Kerr Higley, 1860-1908; Albert Schneider, 1863-
Publication info: Chicago,American Audobon association[c1914]
Subjects: Natural history
Source: http://www.biodiversitylibrary.org/page/32495618#page/73/mode/1up

The knobby argonaut or knobbed argonaut (Argonauta nodosa) 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).

The crusty nautilus or fuzzy nautilus (Allonautilus scrobiculatus) is a species of nautilus native to the waters around New Guinea, specifically New Britain and Milne Bay, and the Solomon Islands. A. scrobiculatus is instantly recognizable by the large open umbilicus