Annette,
I just did a simple search on the internet for "Shantou cemetery" and, much to my surprise, came up with this link to a lone cemetery on Double Island (Masu) in Shantou (aka Swatow) which was used to bury foreigners who had died there:
http://www.bris.ac.uk/Depts/History/Customs/TalbotStones.pdfBecause this list was compiled quite late in 1922, many of the headstones were already not legible for recording any details. Unfortunately, this link only lists 17 foreigner burials that were legible, and the name "
Gunther" were not among them. However, this does not mean that Carl
Gunther was not buried there. You can start your search with the
Royal Asiatic Society in Shanghai, to which this list was sent. With any sort of luck, perhaps they may have information on a complete listing of foreigners buried at Double Island. Good luck!
Raymond