On 2008-07-01 01:36:45 -0700, CJB said:

In Russel Museum in the Bay of Islands, New Zealand, is a fine model
of a tall ship in full sail - squares and fore & aft all set. I think
that it was made by the ex-captain. Out of the four masts, the three
forward masts each had SEVEN yards. What are the yards called? I have
1/ course, 2/ lower topsail, 3/ upper topsail, 4/ royal, 5/
t'gallant, .... but what were nos. 6 and 7? Fair winds - Chris B.

The t'gallant (which is below the royal, not above) can be split, too.
So one possibility is course, lower and upper topsail, lower and upper
topgallant, royal and skysail. Or you could have a single t'gallant and
a moonsail over the skysail--but Wikipedia claims that none of the
four-masted ships carried moonsails.