The Main Strait from Cape Virgins to Cape Pillar from surveys by Captain Richard C. Mayne, C.B. and Officers of H.M.S Nassau, 1867-8. Captain J.F.L.P. Maclear, and Officers of H.M.S. ALert, 1880. And Captain W.J.L. Wharton and Officers of H.M.S. Sylvia 1882-4. The remainder by Captain P.P. King, H.M.S. Adventure and Commanders Pringle Stokes & Robert Fitz-Roy en Officers of H.M.S. Beagle 1826-30.