Remove "Directory Member Paid" in the roles listing

Hello,

I installed Directory on my website but decided to uninstall it, so I uninstalled the plugin yet some stuff remains.
I'd like to remove everything, in particular, in the roles listing of Wordpress, the "Directory Member Paid" and "Directory Member Not Paid" that can be seen here : http://oi46.tinypic.com/2ro2dci.jpg

How can I do that ?

Thank you