been unable to decide to which class these reefs belong. From the distance to which they extend from the land, where the sea is very deep, I am strongly inclined to believe they ought to come within the barrier class, and be coloured blue; but I have been forced to leave them uncoloured.—The last-mentioned groups are connected with the east end of Ceram by a chain of small islands, of which the small groups of _Ceram-laut_, _Goram_ and _Keffing_ are surrounded by very extensive reefs, projecting into deep water, which, as in the last case, I strongly suspect belong to the barrier class; but I have not coloured them. From the south side of Keffing, the reefs project five miles (Windsor Earl’s “Sailing Direct. for the Arafura Sea,” page 9). CERAM.—In various charts which I have examined, several parts of the coast are represented as fringed by reefs.—_Manipa_ Island, between Ceram and Bourou, in an old MS. chart in the Admiralty, is fringed by a very irregular reef, partly dry at low water, which I do not doubt is of coral-formation; both islands coloured red.—_Bourou;_ parts of this island appear fringed by coral-reefs, namely, the eastern coast, as seen in Freycinet’s chart; and _Cajeli Bay_, which is said by Horsburgh (volume ii., page 630) to be lined by coral-reefs, that stretch out a little way, and have only a few feet water on them. In several charts, portions of the islands forming the AMBOINA GROUP are fringed by reefs; for instance, _Noessa_, _Harenca_, and _Ucaster_, in Freycinet’s charts. The above-mentioned islands have been coloured red, although the evidence is not very satisfactory.—North of Bourou the parallel line of the _Xulla Isles_ extends: I have not been able to find out anything about them, excepting that Horsburgh (volume ii., page 543) says that the northern shore is surrounded by a reef at the distance of two or three miles; uncoloured.—_Mysol Group;_ the Kanary Islands are said by Forrest (“Voyage,” page 130) to be divided from each other by deep straits, and are lined with coral-rocks; coloured red.—_Guebe_, lying between Waigiou and Gilolo, is engraved as if fringed; and it is said by Freycinet, that all the soundings under five fathoms were on coral; coloured red.—_Gilolo_. In a chart published by Dalrymple, the numerous islands on the western, southern (_Batchian_ and the _Strait of Patientia_), and eastern sides appear fringed by narrow reefs; these reefs, I suppose, are of coral, for it is said in “Malte Brun” (volume xii., page 156), “Sur les cotes (of Batchian) comme _dans le plupart_ des iles de cet archipel, il y a de rocs de medrepores d’une beauté et d’une variété infinies.” Forrest, also (page 50), says Seland, near Batchian, is a little island with reefs of coral; coloured red.—_Morty_ Island (north of Gilolo). Horsburgh (volume ii., page 506) says the northern coast is lined by reefs, projecting one or two miles, and having no soundings close to them; I have left it uncoloured, although,