suspensions

I've been working through the book "Purely functional data structures" using
SML/NJ and came to the $ notation for creating suspensions.  It seems as
though SML/NJ has some kind of $-based notation, but it doesn't behave the
same way as the one in the book.  For instance, $f x doesn't work - it seems
to bind as ($f) x - and writing $(f x) isn't what you want because that
evaluates "f x" eagerly.  The samples in the book don't compile and I can't
find any mention of the $ notation in the documentation or indeed anywhere
online.

Can anyone explain how the $ stuff works in SML/NJ?  Any help would be much
appreciated :)
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