There is a Marcella Cecilia Scrimshaw listed in the January to March 1894 birth index, Islington district, London, volume 1b page 238?

In the 1901 census living at 25 Union Road Islington civil parish, St George ecclesiastical parish, London, Islington district, Upper Holloway subdistrict
Head Edward Scrimshaw, age 40, printers machine foreman, worker, born Middlesex.
Wife Mary S. Scrimshaw, age 38, born St. Pancras, London
Daughter Mary T. Scrimshaw, single, age 15, born Levington, Surrey.
Son Sidney H. Scrimshaw, single, age 12, born Levington, Surrey.
Son Edward F. Scrimshaw, age 11, born St. Pancras, London
Son Herbert Scrimshaw, age 10, born St. Pancras, London.
Son Frederick Scrimshaw, age 9, born Islington, London
Daughter Marcella C. Scrimshaw, age 7, born Islington
Son Horace G. Scrimshaw, age 5, born Islington
Boarder Marcella Smith, widow, age 56, living on own means, born St. Pancras, London
Boarder George L. Symondson, single, age 31, Civil Service Somerset House, worker, born St. Pancras
Boarder Horace D. Symondson, single, age 25, civil service post office sorter, worker, born St. Pancras
Boarder Ernest Hudson, single, age 26, civil service, worker, born St. Pancras
Daughter Martha E. Tearall, single, age 31, drapers assistant, worker, born Lenham?, Kent
Daughter Frances E. Tearall, single, age 23, dressmaker, worker, born Tunbridge Wells, Kent.
Son Ernest S. Tearall, single, age 25, Railway Engine cleaner, worker, born Tunbridge Wells
Son Thomas E. Tearall, single, age 21, clerk commercial, worker, born St. Pancras, London.
[Mary S. Scrimshaw is Marcella Smith’s daughter. Thus the other Scrimshaws are Marcella’s son in law and grandchildren. George and Horace Symondson are Marcella’s nephews, sons of her brother Frederick Thomas Symondson. Later this year Ernest Hudson will marry Marcella’s niece Kate Marcella Symondson, sister to George and Horace. In 1906 Frances E. Tearall will marry Horace Symondon. Martha, Ernest and Thomas Tearall are Frances’s siblings.]

In the 1911 census 25 Union Road, Tufnell Park, London , Islington district, Tufnell sub district. Head,
Edward Scrimshaw, married, age 51, printer, born Middlesex.
Wife Mary Scrimshaw, married 26 years, age 50, born Middlesex.
Daughter Mary Scrimshaw, single, age 25, commercial clerk, born Surrey.
Son Sidney Scrimshaw, single, age 23, commercial clerk, born Surrey.
Son Edward Scrimshaw, single, age 21, government clerk, born Middlesex.
Son Herbert Scrimshaw, single, age 20, law clerk, born Middlesex.
Son Frederick Scrimshaw, single, age 19, law clerk, born Middlesex.
Daughter Marcella Scrimshaw, age 17, commercial clerk, born Middlesex.
Son Horace Scrimshaw, age 15, school, born Middlesex.
Son William Scrimshaw, age 9, school, born Middlesex.
Wife’s mother Marcella Smith, widow, age 69, born Middlesex.

London Electoral Registers 1930
130 Sunningfield Road, Hendon, Barnet
Daisy Emma Scrimshaw
Marcella Scrimshaw
Mary Sidney Scrimshaw
Mary Teresa Scrimshaw
Sidney Henry Scrimshaw

1939 England and Wales Register
61 Hale Lane, Hendon, Middlesex
1. Mary T. Scrimshaw, born March 30, 1890 [changed to 1886], single, secretary shorthand typist unemployment
2. Marcella C. Scrimshaw, born January 26 1994, single, typist-Invoice Unemployment
3. Alfred J. R. Murray, born August 29 1915, single, specialist ??? storage ??? draughtsman and Designer
4. James [Patrick added later] Murphy, born July 17 1902, single, draughtsman and designer aircraft jig and tool

In the January to March 1968 death index Marcella C. Scrimshaw, age 74, Bristol, Gloucestershire, volume 7b, page 196.