Only show specific nav item to members

Hi All,
I wondering how i can go isolate a specific nav item as the main listing is being populated by its function.

I would like to publish a specific nav item for members only.

The following code if from, function t_show_pagemenu and seems to put all the nav items into a variable called $pages.

$pages = wp_list_pages('sort_column=menu_order&title_li=&echo=0&depth=0&exclude='. $exclude);
$pages = preg_replace('%<a ([^>]+)>%U','<a $1><span>', $pages);
$pages = str_replace('</a>','</span></a>', $pages);
echo $pages;

How can i go about checking if any of the nav items are named ‘monkey’, so i can then set up a statement like the following:

if (!is_user_logged_in()) {
   If a nav item = "monkey" {
   dont display it
   }
   echo $pages;
} else {
   //poplulate as normal
   $pages = wp_list_pages('sort_column=menu_order&title_li=&echo=0&depth=0&exclude='. $exclude);
   $pages = preg_replace('%<a ([^>]+)>%U','<a $1><span>', $pages);
   $pages = str_replace('</a>','</span></a>', $pages);
   echo $pages;
}