Hi Davie,
you're in luck, Alexander and Christina are buried in the Private cemetery adjacent to the old churchyard, it's in an awful condition now but it was a lovely old place until a few years ago.
The lair number is "Private 487".
buried there are the following -
ALEXANDER SCOTT. colliery manager, West Calder, aged 41 years, married.
Parents - William Scott and Margaret Anderson.
Interred 14 March 1868.
CHRISTINA SCOTT. Wishaw, aged 52 years, widow.
Parents - Robert Ellis and Ann Jamieson.
Interred 18 June 1879.
ELIZABETH ELLIS. Bothwell, aged 20 months.
Parents - Robert Ellis and Janet Muirhead.
Interred 2 June 1880.
JANET ELLIS, housewife, Midcalder, aged 37 years.
Parents - William Muirhead and Elizabeth Russell.
Interred 4 November 1890.
THOMAS NICOL ELLIS. Shettleston, aged 5 weeks.
Parents - Robert Ellis and Ann Nicol.
Interred 17 December 1891.
JOHN ELLIS. Tollcross, aged 7 months.
Parents - Robert Ellis and Annie Nicol.
Interred 3 June 1893.
ELIZABETH MOFFAT ELLIS. Shettleston, aged 11 months.
Parents - Robert Ellis and Ann Nicol.
Interred 11 November 1895.
ANNIE ELLIS. Housewife, Coatbridge. 34 years, married.
Parents - Thomas Nicol and Elizabeth Moffat.
Interred 22 April 1899.
I think you may already have the monumental inscription from the old churchyard for John Ellis and Elizabeth Gardner.
Lodger.