submarine mountain range on which the Loyalty Island group is formed. This range evidently paralleling the central chain of New Caledonia. It is plainly seen that the island has had only one upheaval. Originally it was a series of disconnected islands probably formed by debris on the higher points of reef of a coral chain, much as Beaupre Island is today. These received a lift of 100 feet or so and today present sheer coral faces. A wide level coral foot had formed about the base of these, more especially on the inner or sheltered side of the ring and these today are only a few feet above sea level and more or less flat and level. A similar formation today being present on the floor of the lagoon which for most of its area averages 6 to 10 fathoms in depth. The largest and main feature of the island is the lagoon which is roughly 20 miles north and south by 18 miles east and west. It is a more or less continuous coral chain like a drawn out O with a break to the west where the drawing out has been greatest. The mainland and Mouli Island form an almost continuous land mass along the east side running N and S and a short distance along the N and S sides. The rest of the coral ring being formed by a chain of Islands and rocks above water and a submerged joining reef awash at low tide with here and there definite distinct breaks of varying depths and widths, though all are narrow except the largest one in the west which is about 3 miles wide. The Mainland. (Which for all intents and purposes may include the Island of Mouli and the small Island of Lecking all of which are only divided by about 100 yards of water). This lies roughly north and south for distance of about 20 miles with a short leg of 2 miles running to the west at the north end and 3 miles SW at