Hello Philip,

This must be the Baptism of Margaret Christian.

From FamilySearch,

Name: Margaret Christian
Event Type: Christening
Event Date: 27 Jun 1841
Event Place: Rushen, Isle of Man
Gender: Female
Father's Name: John Christian
Mother's Name: Agnes French

One of Edward & Margaret (Christian) Corrin 's Sons is named - William French Corrin.

Averil