Maria Emma Smith (1787–1812)
Maria Emma Gray (1812–1876)

Conchologist and algologist. Daughter of Henry Smith, lieutenant in the Royal Navy. Married Francis Edward Gray in 1812; after his death, married his second cousin John Edward Gray in 1826. Published five volumes of etchings of molluscs (1842–74). Studied and collected algae; her collection was bequeathed to Cambridge University Museum. Commemorated by J. E. Gray in the algae genus Grayemma.