How can i convert checkboxes into dropdown list?

I have few checkboxes and I want to convert them into dropdown list. I tried something but don't know at the end what to do?

<form id="form-wysija-2" class="widget_wysija" action="#wysija" method="post">
    <p class="wysija-checkbox-label">Select list(s):</p>
        <p class="wysija-checkbox-paragraph">
            <label>
                <input class="wysija-checkbox validate[required]" type="checkbox" value="1" name="wysija[user_list][list_id][]">

                    General Antiques

            </label>
        </p>
        <p class="wysija-checkbox-paragraph">
            <label>
                <input class="wysija-checkbox validate[required]" type="checkbox" value="3" name="wysija[user_list][list_id][]">

                Antique & Collectible Tools

            </label>
        </p>
</form>

and i tried following jQuery to convert these checkboxes into dropdown list. but don't getting to how to done this successfully.

jQuery(document).ready(function($){

  var extra, checkBoxesName,
      checkBoxlabel,
      checkBoxes = $('.wysija-checkbox-paragraph');

  var checkBoxesLabel = $('.wysija-checkbox-label');


  checkBoxesName = checkBoxes.find('input').prop('name');
  checkBoxlabel = checkBoxes.find('label').text();

  checkBoxesLabel.append('<select name="'+checkBoxesName+'">'+extra+'</select>');
  $('.wysija-checkbox-paragraph').each(function(n){
    var dataText = $(this).find('label').text();
    $('select[name='+checkBoxesName+']').append('<option value="'+n+'">'+dataText+'</option>');
  });

  //checkBoxes.remove();

});