I prefer to call a "receiving" variable what it really is, so in subroutine BAR, I would do this:

sub BAR
{
   my $arrayref = shift; #This will receive the array *reference* from
+ FOO

   ### Then, I can refer to specific elements of the
   ### array using the arrayref:
   my $first_element = $arrayref->[0];

   ### or by turning the arrayref back into an array:
   my @bar_array = @{$arrayref};
   my $1st_element = $bar_array[0];

   #code here
}
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Remember, FOO is passing an array *reference* to BAR, so BAR receives an array *reference* - just my preference for clarity to include "ref" in the name of the variable so it's easy to tell what the variable contains. HTH.