John, Anastasia or Mary Hynes

My Great, great grandfather John Hynes came from County Galway to Canada in the early 1880's after his wife Catherine Burk(e) Hynes died.  He brought their two daughters Annie (officially Anastasia) and Mary. 

I think they were from Barnaderg or area based on Mary's baptism record (April 1871) but this is not necessarily the correct Mary Hynes (common name?) and I can't find any record for an Anastasia Hynes born to a John and Catherine (birthdates on census data varies from July to February and from 1869 to 1875, but she was older than Mary).  I do know that the parents names are correct though from both girls' marriage certificates.  I also cannot find a John Hynes, Mary Hynes or Annie Hynes of the correct ages on any passenger records to Canada.

Any suggestions would be appreciated.