Thank you, Chuck. I also did a search on the internet for Exonia, and quite a number of homepages for Exeter popped up on the list, including Exeter University in Devon, England. If they were originally from Scotland, it's still possible that they might have boarded a ship in Exeter, Devonshire. Food for thought. I must have lived previous lives.
Business is closed.
She did not comment to me on the accuracy of the information contained in the letter. A MacFarlane Clan is listed. This sentence appears to tie in with some of what is in Mrs. Rainaud's letter. I submit this to see if anyone had done any research that would confirm or repudiate this information. Although many Turners here in the US do use the one depicted in the drawing you sent, it would not be the authentic one to be used by descendants of Shadrach Turner.