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Plesiosaur question

In Prehistoric Times (I think), they had an article on last year's
discoveries.  One was on a plesiosaur that had stomach contents
intact, several amonites.  The article indicated that 1) plesiosaur
teeth couldn't crack the shell, 2) that the amonites were found in
the area of the stomach cavity intact with no sign of shells, and
concluded that stomach acids had disolved the shells.  

Apparently the article was over-abbreviated.  This lead to a number 
of questions.  Does anyone have the scoop on this?