More Info

NSW Medical Board ...
4 Jan 1861
List gives an interesting clue as to the purpose of THE LIST
To define persons who have submitted their testimonials of qualification to that board SO THAT the board can then determine those Medical Practitioners who are suitably qualified as Medical Witnesses at Coroners Inquests and Inquiries held before Justices of the Peace in the Colony of NSW ...
I read that to indicate that Medical Practioners who don't want to be witnesses at Coroners Inquests were not required to submit themselves for the Board to confirm or request their medical qualifications
See the NSW Government Gazette Pt 1, pg 42 1861 January.
The Doctor whose name appears on one of the d.c. for one of my forebears who died in 1860 in NSW is NOT on this list. Some years ago I confirmed he was a legit doctor. Now I realise why I have not found him on that list

As there is NOT any doctor with the surname BENSON on that list either perhaps neither wanted to be called away to Coroner's Inquests
Dr Benson is NOT on the list for 1870 either, however the heading on that list only says that the list is a List of Medical Practioners prepared in accordance with the Act of Parliament of NSW 2nd Vic No. 22 (this detail was on the 1861 list)
Dr William John ANDERSON ... a Fellow of Royal College of Surgeons, Edinburgh 1848 is on both the 1861 and the 1870 list, so perhaps Dr ANDERSON could rely on Dr BENSON to take care of their patients if he (Dr A) needed to attend to Coroners matters. (Dr Anderson .... I mentioned him re the medical partnership at Glebe with Dr Barker BENSON)
Cheers, JM