Casus (n.pl.) belli

[entscheidung]

See footnote 3: "Yes, the plural of 'casus' is 'casus'."

http://opinionator.blogs.nytimes.com/2011/11/07/the-worlds-largest-sandbox/?ref=opinion

The other two Borderlines comments are also interesting--when I was young I was enamored of glossy atlases (Atlades?) and have enjoyed these.