Thank you for your message. I hope that someone with information makes a connection with you.
In the meantimes, some websites that you may find useful are:
The Library & Archives of Canada - http://www.collectionscanada.gc.ca/index-e.html
Genealogy Tool-kit: http://www.irish-genealogy-toolkit.com/Canadian-immigration-records.html
Alternatively, you could try contacting Roscommon Heritage and Genealogical Centre for possible assistance, a fee may apply however. Here are their contact details:
Heritage and Genealogical Centre,
Phone: +353 (0) 71 9633380 Email: firstname.lastname@example.org
I hope this is helpful.