This must be a bit confusing for you but I checked the General Muster List of NSW 1823, 1824, 1825 and this was the entry for Richard Walker per Somersetshire 1814.
44011 Richard Walker CP, Somersetshire 1814, Life, Clerk in Sydney
44012 Emma Walker, 17, CF, dau of Richard Walker per Somersetshire
44013 Maria Walker, 14, CF, dau of Richard Walker Sydney
44014 Mary Walker, CF, wife, died 1823 Sydney
Cazay