Should the fonts listed by xlsfonts be used by emacs?

[c.c]

Hi,

I am tring use the font simsun in my GNU Emacs 21.4.1. I think I have
setuped this font correctly, because I can see it in the xlsfonts's
output, like this

-misc-simsun-medium-r-normal--0-0-0-0-p-0-gb2312.1980-0
-misc-simsun-medium-r-normal--0-0-0-0-p-0-gbk-0
-misc-simsun-medium-r-normal--0-0-0-0-p-0-iso10646-1
-misc-simsun-medium-r-normal--0-0-0-0-p-0-iso8859-1
-misc-simsun-medium-r-normal--0-0-0-0-p-0-jisx0208.1983-0
-misc-simsun-medium-r-normal--0-0-0-0-p-0-jisx0208.1990-0
-misc-simsun-medium-r-normal--0-0-0-0-p-0-koi8-r

but when I try to use these fonts in my emacs like this

emacs -fn "-*-simsun-medium-r-*-*-12-*-*-*-p-*-gb2312.1980-*"

I always fail with message "X protocol error: BadName (named color or
font does not exist) on protocol request 77".

what's wrong ?

Thanks.