Did you eventually find out information in relation to Richard Dalton?
I have an Alice Dalton (born Abt. 1828) from Kilbeggan in my family tree who was transported with her sister Catherine Nally (nee Dalton) (Abt. 1818) to Tasmania (previously - Van Diemens Land) Australia in 1853.
She had other sisters Jane (Abt 1835)Winifred (unkn) and Mary (unkn)
She had two brothers Richard (unkn) and Thomas (unkn). It is believed Thomas moved to USA before 1852 but I do not know what happened to Richard, he may have still been in Ireland in 1852 but not sure.