Although this Marcella Sherlock was born in Ireland, not Australia, nine years earlier than the date you have--but on May 18--perhaps she should not be discounted as your ancestor....or at least a relative of your Marcella.
Name: Marcella Sherlock
Date of Birth:
Date of Baptism: 18-May-1824
Address:
Parish/District: Kildalkey
Gender: County Co. Meath
Denomination:
Father: Thomas Sherlock
Mother: Margaret Flinn
Occupation:
Sponsor 1 /
Informant 1: Hart Michael
Sponsor 2 /
Informant 2: Sherlock Anne
Notes:
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www.rootsireland.ie
If you have any other information about your Marcella--husband, children, etc.--why not post it?