How do I delete a "gallery" completely?

I'm creating a book for a vacation I just took, and I got a little confused when I was making galleries and now have about 10 of them with the same name and photos. And my photo list has a bunch of duplicates in it. How can I easily delete them without opening each photo and deleting it?

When I try to delete the gallery, it will let me delete the photos, but not the name of the gallery. Is there a way to have a list and a checkbox next to it to delete them?