score:15

Accepted answer

If you know the id of series already you can get a reference to the series by chart.get(ID)

If you want to loop through all the series and list all the IDs of series, do this: 

 $(chart.series).each(function(i, serie){console.log(serie.options.id)})

FIddle : http://jsfiddle.net/NaK9D/2/

score:2

From the documentation:

Another way to reference the series programmatically is by id. Add an id in the series configuration options, and get the series object by chart.get(id).

Looks like you can do:

$(chart.series).each(function(i, serie){
  this.get(id);
});

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