Qualifications: Lic Royal College Surgeons Edinburgh 1836
Thomas Somerville was appointed Assistant-Surgeon to the Ringdove on 18 May 1837. 
He was appointed Assistant-Surgeon to the Conway at Portsmouth 23 May 1843
He was appointed Surgeon to the Cleopatra at the Cape of Good Hope 14 June 1845
Thomas Somerville was employed as Surgeon Superintendent on the convict ship St. Vincent to Van Diemen's Land in 1853.
Thomas Somerville is listed in the Medical Register 1861
Residence Surgeon Royal Navy H.M.S. Cornwallis
On 15 October 1868 he held the rank of Deputy Inspector-General of Hospitals and Fleets on the Retired List. 
He died 23 January 1894 at Strathview, Larnarkshire, Scotland.
Obituary - British Medical Journal
Thomas Somerville was appointed Surgeon on 18 May 1837; Staff Surgeon 10 January 1846; Fleet Surgeon 5 August 1861; and Deputy Inspector-General 15th October 1861, on which date he retired from the service. -