See Krusenstern's Recueil de Memoires Hydrographiques etc.
page 154.) CAPTAIN DUMONT D'URVILLE.
Since Bougainville's voyage the southern shores of the Louisiade remained unvisited until the year 1840, when Captain Dumont d'Urville, with the French corvettes L'Astrolabe and La Zelee, during his last voyage round the world, determined upon attempting their exploration.

On May 23rd, the expedition (coming from the eastward) rounded Adele Island and Cape Deliverance, at the distance of about twenty miles.

Next morning, the thickness of the weather prevented them from clearly distinguishing the features of the land.

They steered towards South-east Island, but found close approach prevented by an immense continuous reef, supposed to be part of that seen on the previous day to the southward of Rossel Island.
On Conde's Peninsula, some natives and a small village were observed.

In the evening a long line of islands (the Calvados group) appeared to the north, and the reef, which before had been continuous, with the exception of some small openings, now existed only as a few isolated patches.
D'Urville stood off to sea for the night, and next morning passed close to some low woody islets (Montemont) enclosed by a reef stretching to the eastward, and supporting upon it many scattered islands covered with verdure.