Hi scallywaggles,
This appears to be the birth that Alan's Tree refers to
1721/1857 HARRIS CATHERINE (f) ANTONIA (m) MARY
I cannot see a birth within the right dates for Catherine with parents John and Mary.
Looks like the death of Antonio
6126/1873 HARRIS ANTONIO AGE 58 YEARS DIED PARRAMATTA
Marriage
Antonio Harris to Mary Ann Macnamara 1856 Sydney, New South Wales
Kellie