216 APPENDIX. 



large island of S. Espiritu, nor Bligli Island, nor Banks' Islands, 

 which latter lie to the N.E. of the Hebrides. But in none of 

 these cases have I met with any detailed account of their 

 shores, or seen plans on a large scale ; and it will be evident 

 that a fringing-reef of only thirty, or even a few hundred yards 

 in width, is of so little importance to navigation, that it will 

 seldom be noticed, excepting by chance ; and hence I do not 

 doubt that several of these islands, now left uncoloured, ought 

 to be red. 



Santa-Cruz Group. — Vanikoro (Fig. 1, Plate I.) offers a 

 striking example of a barrier-reef : it was first described by 

 the Chevalier Dillon, in his Voyage, and was surveyed in the 

 Astrolabe ; coloured pale blue. — Tikopia and Fataka Islands 

 appear, from the descriptions of Dillon and D'Urville, to have 

 no reefs : Anouda is a low, flat island, surrounded by cliffs, 

 {Astrolabe. Hydrog. and Krusenstern Mem. vol. ii. p. 432) ; 

 these are uncoloured.-— Toupoua (Otooboa of Dillon) is stated 

 by Captain Tromelin (Annales Marit. 1829, p. 289) to be al- 

 most entirely included in a reef, lying at the distance of two 

 miles from the shore. There is a space of three miles without 

 any reef, which, although indented with bays, offers no anchor- 

 age from the extreme depth of the water close to the shore : 

 Captain Dillon also speaks of the reefs fronting this island ; 

 coloured blue. — Santa Cruz : I have carefully examined the 

 works of Carteret, Dentrecasteaux, "Wilson, and Tromelin, and 

 I cannot discover any mention of reefs on its shores ; left un- 

 coloured. — Tinakoro is a constantly active volcano without 

 reefs. — Mendana Isles (mentioned by Dillon under the name 

 of Mammee, &c.) are said by Krusenstern to be low, and in- 

 tertwined with reefs. I do not believe they include a lagoon ; 

 I have left them uncoloured. — Duff's Islands compose a small 

 group directed in a N.W. and S.E. band ; they are described 

 by Wilson (p. 296, Miss. Voy. 4to. edit.) as formed by bold 

 peaked land, with the islands surrounded by coral-reefs, ex- 

 tending about half a mile from the shore : at the distance of 



