212 APPENDIX. 



them, nor Durour is/d, which is described by Carteret 

 as low. 



The Caroline Arch, is now well known, chiefly from 

 the hydrographical labours of Lutke ; it contains about forty 

 groups of atolls, and three encircled islands, two of which 

 are engraved in Fig. 3, Plate L, and Fig. 3, Plate II. Com- 

 mencing with the eastern part; the encircling reef round 

 Ualen appears to be only about half a mile from the shore ; 

 but as the land is low and covered with mangroves ( Voyage 

 autour du Monde, par F. Lutke, voL i. p. 339), the real 

 margin has not probably been ascertained. The extreme 

 depth in one of the harbours within the reef is thirty-three 

 fathoms (see charts in atlas of Coquille's voyage), and out- 

 side at half a mile distant from the reef, no bottom was 

 obtained with 250 fathoms. The reef is surmounted by 

 many islets, and the lagoon-like channel within is mostly 

 shallow, and appears to have been much encroached on by 

 the low land surrounding the central mountains ; these 

 facts show that time has allowed much detritus to accu- 

 mulate ; coloured pale blue. — Pouynipete, or Seniavine. In 

 the greater part of the circumference of this island, the reef 

 is about one mile and three quarters distant ; on the north 

 side it is five miles off the included high islets. The reef 

 is broken in several places ; and just within it, the depth 

 in one place is 30 fathoms, and in another, 28, beyond 

 which, to all appearance, there was " un porte vaste et sur " 

 (Lutkd, vol. ii. p. 4); coloured pale blue. — Hogoleu or 

 Roug. This wonderful group contains at least 62 islands, 

 and its reef is 135 miles in circuit. Of the islands, only 

 a few, about six or eight (see Hydrog. Description, p. 428, 

 of the Voyage of the Astrolabe, and the large accompanying 

 chart taken chiefly from that given by Duperrey) are high, 

 and the rest are all small, low, and formed on the reef. 



