Mike, thanks for the information. There is no doubt that this is the family of my great-great gandfather's brother(Joseph). He (James) had a much more respectable career than Joseph, who deserted his wife. James would not have approved of him. I'm fascinated to see that the son Joseph was a soldier (albeit briefly) in the Civil War. I had seen a record for him and wondered if it was the same Joseph. He was very young.
I am hoping there may be some descendants of the American branch who we may be able to contact: our branch (Australian) has maintained contact with the Cornish branch and we have family letters going back to the mid 1880s.
Joseph Henry Pryor (1847- 1873), nephew of James Thomas Pryor, son of Joseph, migrated to USA , Mass., married and died at Cambridge, Mass. In 1873.
There remains one Pryor unaccounted for: William Rapson Pryor, b.1849-50 in Wendron, nephew of James Thomas Pryor and brother of Joseph Henry Pryor. According to family information he, too, migrated to America, sometime after 1871 (last English census he appears on is 1871). Family information is vague but he is reported as dying in a mining accident in the USA in the 1880s - thought to be in the Midwest. I have found no trace of him.
I really appreciate your work, Mike, many thanks.