Hi Mary,
Are you sure about your dates, because a Henry McShane and Mary A. Toner had a son James McShane was baptised on 1st October 1844 in the RC Parish of Shankill, Lurgan in Co. Armagh, Ireland and a Jane Heaney is listed as the sole sponsor/godparent? Could these be your people?
They are listed as living in Lurgan in 1844. If this is your Henry McShane and Mary Toner, they were probably born in the 1820s, and Henry McShane and Mary Coyle were probably born earlier in the 1800s.
Regards, McShane1