How do I open multiple files in one window in emacs 24?

Using Debian, when selecting multiple files in nautilus and opening them in emacs 23, they all start in the same window with a different buffer for each.

However, with emacs-snapshot (GNU Emacs 24.4.50.1), all of these files are opened in different frames, which I find very annoying as I usually like to have all of these files grouped together.

How can I follow the old behavior of selecting files in nautilus and open them in one frame with multiple buffers?

I know I can drag and drop or open from the terminal, but I'd rather choose from nautilus.