[jQuery] about :not(:last)

Hi!
Please, consider this code:

$.fn.url2 = function(absoluta) {
var slots = $(this).parents('dl:not(:last)').map(function() {
return $(".Texto:first", $(this)).text();
});
var slots2 = $(this).parents('dl').map(function() {
return $(".Texto:first", $(this)).text();
});
return slots.get().join("/") + ' -- ' + slots2.get().join("/");
};

The funny thing of this code is that slots and slots2 have the same
items
Could you point me why slots put the last dl?

I suppose that dl:not(:last) retrieves all the parents except the last
one but this don't work

Thanks!