Although there appears to be many variants to the spelling of his name, Delalande seems to be the way the family wrote it, but a recent scholarly work has it as De Lalande.
BRITISH CONTRALTO EDITH FURMEDGE (1890-1956) CDR
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*EDITH ELLEN FURMEDGE (LONDON, 27 MARCH, 1890 — LONDON, 9 OCTOBER, 1956)*
After secondary school she attended Homerton College, Cambridge ...