Forms API and hook_menu

I'm a beginner at Drupal and I'm trying to use the Forms API to build a form for my site. I followed the QuickStart guide and I've delved a little into the API reference. However I have got stuck on implementing the hook_menu for my 'test' module. Below is my code. The problem is that the test page itself works fine, but the form page comes after it just gives a 'Page not found error'.

For example 'http://localhost/mytest' works fine. 'http://localhost/mytest_form' gives page not found.

Any pointers would be appreciated.

Cheers,

Cliff

function mytest_menu() {

  $items = array();

  $items['admin/settings/mytest'] = array(
    'title' => ' my test admin settings',
    'description' => 'Description of test module',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('mytest_admin'),
    'access arguments' => array('access administration pages'),
    'type' => MENU_NORMAL_ITEM,
   );

  $items['mytest'] = array(
    'title' => 'mytest page',
    'page callback' => 'mytest_all',
    'access arguments' => array('access test content'),
    'type' => MENU_CALLBACK,
  );

  $item['mytest_form'] = array(
    'title' => 'my test form',
    'page callback' => 'mytest_myform',
    'access arguments' => array('access test content'),
    'type' => MENU_CALLBACK,
  );

  return $items;
}