Anatomy of Nautilus
Date 1855
Source (1 January 1855). "On the Anatomy of Nautilus umbilicatus, Compared with That of Nautilus Pompilius". Philosophical Transactions of the Royal Society of London 145 (2): i–xii+1–178+i–vi+179–424+1–16. ISSN 02610523.
Author John Denis Macdonald
Source: https://commons.wikimedia.org/wiki/File:Nautilus_anatomy_1855_01.png

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. Allonautilus scrobiculatus is instantly recognizable by the large open umbilicus.