FRIENDLY ARCHIPELAGO.—_Pylstaart_ Island. Judging from the chart in Freycinet’s “Atlas,” I should have supposed that it had been regularly fringed; but as nothing is said in the “Hydrog. Memoir” (or in the “Voyage” of Tasman, the discoverer) about coral-reefs, I have left it uncoloured.—_Tongatabou_: In the “Atlas of the Voyage of the _Astrolabe_,” the whole south side of the island is represented as narrowly fringed by the same reef which forms an extensive platform on the northern side. The origin of this latter reef, which might have been mistaken for a barrier-reef, has already been attempted to be explained, when giving the proofs of the recent elevation of this island.—In Cook’s charts the little outlying island also of _Eoaigee_, is represented as fringed; coloured red.—_Eoua._ I cannot make out from Captain Cook’s charts and descriptions, that this island has any reef, although the bottom of the neighbouring sea seems to be corally, and the island itself is formed of coral-rock. Forster, however, distinctly (“Observations,” p. 14) classes it with high islands having reefs, but it certainly is not encircled by a barrier-reef and the younger Forster (“Voyage,” vol. i, p. 426) says, that “a bed of coral-rocks surrounded the coast towards the landing-place.” I have therefore classed it with the fringed islands and coloured it red. The several islands lying N.W. of Tongatabou, namely _Anamouka, Komango, Kotou, Lefouga, Foa_, etc., are seen in Captain Cook’s chart to be fringed by reefs, in several of them are connected together. From the various statements in the first volume of Cook’s “Third Voyage,” and especially in the fourth and sixth chapters, it appears that these reefs are of coral-formation, and certainly do not belong to the barrier class; coloured red.—_Toufoa and Kao_, forming the western part of the group, according to Forster have no reefs; the former is an active volcano.—_Vavao._ There is a chart of this singularly formed island, by Espinoza: according to Mr. Williams it consists of coral-rock: the Chevalier Dillon informs me that it is not fringed; not coloured. Nor are the islands of _Latte_ and _Amargura_, for I have not seen plans on a large scale of them, and do not know whether they are fringed. _Niouha_, 16° S., 174° W., or _Keppel_ Island of Wallis, or _Cocos_ Island. From a view and chart of this island given in Wallis’s “Voyage” (4to ed.) it is evidently encircled by a reef; coloured blue: it is however remarkable that _Boscawen_ Island, immediately adjoining, has no reef of any kind; uncoloured. _Wallis_ Island, 13° S., 176° W., a chart and view of this island in Wallis’s “Voyage” (4to ed.) shows that it is encircled. A view of it in the _Naut. Mag._, July 1833, p. 376, shows the same fact; blue. _Alloufatou_, or _Horn_ Island, _Onouafu_, or _ Proby_ Island, and _Hunter_ Islands, lie between the Navigator and Fidji groups. I can find no distinct accounts of them.