Hi Barb
Sorry I either din't receive your posting or missed it!!
I don't have access to birth certificates you would have to get them from the parish I guess.
But I found the follow
Coulling Triton William Romford 12 191 Birth Sept Q 1838
-Marriage Dec 1859 to Mary Ann Chapman
Coulling Triton William Hull 9d 417
As you have the certificate for Triton and Mary Ann Pearce marrige there must be two Triton Coullings!! How odd!!
Cal