Pete Smith has been doing some more detective work, and has provided us with a list of the Children who went out on the “Layton” in 1837, but who don’t appear to have arrived in Sydney in 1838.
It has been confirmed that out of 42 Bisley children on board, these 17 children died at sea from the measles epidemic that was on board the Ship.

(2 Adults - unknown - also died. The good news is that 2 children were born on the voyage).

Those who died were:

Butt, Eliza born 1829 Bisley Gloucester Died At Sea 1837
Butt, Emma born 1834 Bisley Gloucester Died At Sea 1837
Millard, Robert born 1837 Bisley Gloucester Died At Sea 1837
Millard, Samuel born 1835 Bisley Gloucester Died At Sea 1837
Mills, Emma Born 1830 Bisley Gloucester Died At Sea 1837
Mills, Ephraim Born 1835 Bisley Gloucester Died At Sea 1837
Mills, Rhoda born 1828 Bisley Gloucester Died At Sea 1837
Mills, Samuel Born 1834 Bisley Gloucester Died At Sea 1837
Pacey, Henry born 1835 Bisley Gloucester Died At Sea 1837
Parsons, Abel born 1836 Bisley Gloucester Died At Sea 183
Parsons, George born 1834 Bisley Gloucester Died At Sea 1837
Perrett, William born 1834 Bisley Gloucester Died At Sea 1837
Phelps, Emma born 1829 Bisley Gloucester Died at Sea 1837
Phelps, Henry Arthur born 1836 Bisley Gloucester Died At Sea 1837
Tyler, Maria born 1835 Bisley Gloucester Died At Sea 1837
Tyler, Martha born 1833 Bisley Gloucester Died At Sea 1837
Witts, Caroline born 1833 Bisley Gloucester Died At Sea 1837
Wheeler, Rosanna Born 1835 Bisley Gloucester Died At Sea 1837
Wheeler, Daniel 1834 Bisley Gloucester Died At Sea 1837

Amazingly the other Families didn’t lose any children. The Mills Family lost all of their children, but one was born on the ship.