The film that you want is 1279321
Given the ages of their children, they will cross multiple items.
Here are the children of John Walsh and Kate Lundy that i found in Item 12
-Michael Walsh. Baptism Oct 1893 in Aclare, Sligo, Ireland (Sponsors: Michael Lundy & Mary Kildune).
-Maggie Walsh. Baptism on 29 Oct 1895 in Aclare, Sligo, Ireland (Sponsors: Maurice Lundy & Margaret Durcan).
-Michael Martin Walsh. Baptism Oct 1897 in Aclare, Sligo, Ireland (Jas Walsh and Mary Lundy).
-Henry Joseph Walsh. Baptism Dec 1899 in Aclare, Sligo, Ireland (Sponsors: Pat Lundy, Ellen Lundy).
Let me see what i find in the other items for the 1880s and early 1890s.
I have items 7 and 8 transcribed... i wouldn't be surprised if you find kate lundy here somewherehttp://www.uvawahoo.net/genealogy/Ireland/1279231Item8.htm
John might be too old as the baptisms were not recorded until 1845.. but you should be able to order their marriage record.