WESTERN PART OF THE CAROLINE ARCHIPELAGO.—_Fais_ Island is ninety feet high, and is surrounded, as I have been informed by Admiral Lutké, by a narrow reef of living coral, of which the broadest part, as represented in the charts, is only 150 yards; coloured red.— _Philip_ Island., I believe, is low; but Hunter, in his “Historical Journal,” gives no clear account of it; uncoloured.—_Elivi;_ from the manner in which the islets on the reefs are engraved, in the “Atlas of the ‘Astrolabe’s’ Voyage,” I should have thought they were above the ordinary height, but Admiral Lutké assures me this is not the case: they form a regular atoll; coloured blue.—_Gouap_ (_Eap_ of Chamisso), is a high island with a reef (see chart in “Voyage of the ‘Astrolabe’”), more than a mile distant in most parts from the shore, and two miles in one part. Captain D’Urville thinks that there would be anchorage (“Hydrog. Descript. ‘Astrolabe’ Voyage,” page 436) for ships within the reef, if a passage could be found; coloured pale blue.—_Goulou_, from the chart in the “‘Astrolabe’s’ Atlas,” appears to be an atoll. D’Urville (“Hydrog. Descript.” page 437) speaks of the low islets on the reef; coloured dark blue. PELEW ISLANDS.—Krusenstern speaks of some of the islands being mountainous; the reefs are distant from the shore, and there are spaces within them, and not opposite valleys, with from ten to fifteen fathoms. According to a MS. chart of the group by Lieutenant Elmer in the Admiralty, there is a large space within the reef with deepish water; although the high land does not hold a central position with respect to the reefs, as is generally the case, I have little doubt that the reefs of the Pelew Islands ought to be ranked with the barrier class, and I have coloured them pale blue. In Lieutenant Elmer’s chart there is a horseshoe-formed shoal, laid down thirteen miles N.W. of Pelew, with fifteen fathoms within the reef, and some dry banks on it; coloured dark blue.—_Spanish_, _Martires_, _Sanserot_, _Pulo Anna_ and _Mariere_ Islands are not coloured, because I know nothing about them, excepting that according to Krusenstern, the second, third, and fourth mentioned, are low, placed on coral-reefs, and therefore, perhaps, contain lagoons; but Pulo Mariere is a little higher.