I'm fairly certain that your James Fullerton and my Anna Maria Fullerton are brother and sister. James Fullerton and his wife Ellen Bulter named their son John Howell Fullerton possibly after Anna Maria Fullerton's husband John Howell. Both John Howell and James Fullerton were in the paper stainer/ paper manufacturing business in Philly.
it was nice of you to look at the cemetery for James gravestone. I'm thinking of writing to the cemetery as I am no in the state of PA and have no chance to get there. Maybe they will send more information my way.
If you find anything let me know. I'm always interested in expanding my tree. Thanks Meghan