My Donlans were from Loughrea and in searching for information on them, I came across this book on amazon about the Lally family of Loughrea just before seeing your post. I dont know if its the same family, but there's a chance it could be and it looks like an interesting read.
The Leaving of Loughrea: An Irish Family in the Great FaminePaperback
This is the story of the Lally family between 1818 and 1848. It could just as easily be your story if you have ancestors who were among over a million people who left the beautiful and tragic land of Ireland in the 1840s. This family lived in the Loughrea area, County Galway, Ireland, and their story is similar to that of so many Irish families as they struggled against the odds, were overwhelmed by the tragedy of the Great Famine, and were forced to leave their beloved homeland. This book explores how the Irish lived at this time, how they thought, and the reasons for their situation in Ireland. It brings together the many strands of Irish society and the economics, politics, and philosophy that dominated their lives. It describes the terrible journeys that members of the family undertook to reach England, America, Canada, and Australia.