SUMATRA.—Commencing with the west coast and outlying islands, _Engano Island_ is represented in the published chart as surrounded by a narrow reef, and Napier, in his “Sailing Directions,” speaks of the reef being of coral (also Horsburgh, vol. ii, p. 115); coloured red.—_Rat Island_ (3° 51′ S.) is surrounded by reefs of coral, partly dry at low water, (Horsburgh, vol. ii, p. 96).—_Trieste Island_ (4° 2′ S.). The shore is represented in a chart which I saw at the India House, as fringed in such a manner, that I feel sure the fringe consists of coral; but as the island is so low, that the sea sometimes flows quite over it (Dampier, “Voyage,” vol. i, p. 474), I have not coloured it.—_Pulo Dooa_ (lat. 3°). In an old chart it is said there are chasms in the reefs round the island, admitting boats to the watering-place, and that the southern islet consists of a mass of sand and coral.—_Pulo Pisang_; Horsburgh (vol. ii, p. 86) says that the rocky coral-bank, which stretches about forty yards from the shore, is steep to all round: in a chart, also, which I have seen, the island is represented as regularly fringed.—_Pulo Mintao_ is lined with reefs on its west side (Horsburgh, vol. ii, p. 107).—_Pulo Baniak_; the same authority (vol. ii, p. 105), speaking of a part, says it is faced with coral-rocks.—_Minguin_ (3° 36′ N.). A coral-reef fronts this place, and projects into the sea nearly a quarter of a mile (“Notices of the Indian Arch.” published at Singapore, p. 105).—_Pulo Brassa_ (5° 46′ N.). A reef surrounds it at a cable’s length (Horsburgh, vol. ii, p. 60). I have coloured all the above-specified points red. I may here add, that both Horsburgh and Mr. Moor (in the “Notices” just alluded to) frequently speak of the numerous reefs and banks of coral on the west coast of Sumatra; but these nowhere have the structure of a barrier-reef, and Marsden (“History of Sumatra”) states, that where the coast is flat, the fringing-reefs extend furthest from it. The northern and southern points, and the greater part of the east coast, are low, and faced with mud banks, and therefore without coral. NICOBAR ISLANDS.—The chart represents the islands of this group as fringed by reefs. With regard to _Great Nicobar_, Captain Moresby informs me, that it is fringed by reefs of coral, extending between two and three hundred yards from the shore. The _Northern Nicobars_ appear so regularly fringed in the published charts, that I have no doubt the reefs are of coral. This group, therefore, is coloured red. ANDAMAN ISLANDS.—From an examination of the MS. chart, on a large scale, of this island, by Captain Arch. Blair, in the Admiralty, several portions of the coast appear fringed; and as Horsburgh speaks of coral-reefs being numerous in the vicinity of these islands, I should have coloured them red, had not some expressions in a paper in the “Asiatic Researches” (vol. iv, p. 402) led me to doubt the existence of reefs; uncoloured.