Hi Mary, I would recommend obtaining the marriage record for free from the civil section of www.irishgenealogy.ie as this will provide you with the occupations of Felix, Julia and their fathers as well as their residences when they married and the names of their witnesses, all clues for pushing further back.
I would also suggest searching www.rootsireland.ie as Brian has recommended, searching both for the baptisms of siblings of Felix and Julia but also their siblings' marriage records - for example I came across the marriage record of a Daniel Doherty who seems highly likely to be Julia's brother.
All the best with your research, if you would like us to do some of the research for you when you've explored all that is available online, please visit
https://www.ancestryireland.com/research-services/Best wishes,
Gillian Hunt
Research Officer
Ulster Historical Foundation