The marks were probably made by a statistician - the numbers are perhaps a code for occupations and places of birth.

The O X mark , which has confused the Ancestry transcribers, could be O + in some cases or perhaps O I with a strike mark across the I when a cross check / tally has been performed :-)

The O could be "Omitted" as it seems to be use where a place name or county has been left off the return.

Either way its not OX(FORDSHIRE) in any way shape or form !!!

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example of this

http://www.forum.forest-of-dean.net/index.php?id=37096