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APPENDIX. 
Amargura coloured, for I liave not seen plans of them on a 
large scale, and I do not know whether they are fringed : 
Amargura is said (Athenaeum, 1848, p. 40) to have been 
lately in violent eruption. 
Niouha, 16° S., 174° W., or Eeppel Island of Wallis, or 
Cocos Island : from a view and chart of this island, given 
in Wallis’s Voyage, (4to edit.) it is evidently encircled by 
a reef ; coloured blue. It is, however, remarkable that 
Boscawen Island, immediately adjoining, has no reef of 
any kind ; uncoloured. 
Wallis Island, 13° S., 176° W.: a chart and view of 
this island in Wallis’s Voyage (4to edit.) shows that it is 
encircled. 1 A view of it in the Naut. Mag. July 1838, p. 376, 
shows the same fact. Nine islands, most of them high, 
are said in Wilkes U.S. Exploring Expedition (vol. ii. 
p. 157) to be enclosed within the same reef, through 
which, it is asserted, ships can enter ; coloured blue. 
Alloufatou, or Horn Island, Onouafu, or Proby Island, 2 
and Hunter Islands, lie between the Navigator and Fidji 
groups. I can find no distinct accounts of them. 
Fidji oe Feejee oe Viti Geoup . 3 — Until lately the 
' [Wallis Island is encircled. There are eleven islands, seven of 
which are on the outer reef. — Note sent to Mr. Darwin by Lieut. 
Chas. Smith, H.M.S. Fawn.] 
2 [‘Horn Islands, comprising Fotuna andAlofa; each has a distinct 
fringing-reef. Fotuna is about 2,500 feet and Alofa 1,200 feet high. 
I can give no information regarding the depth of water, except that 
there is a deep ship-channel between the islands, no soundings being 
obtainable with the hand-line. The channel is hardly a mile broad. 
Nina-fu, or Good Hope Island, which I presume to be the same as 
that called Onouafu in Coral Beefs, is entirely volcanic, and has no 
reef whatever.’ — Note sent to Mr. Darwin by Lieut. Chas. Smith, 
H.M.S. Fawn.] 
3 [This group contains every description of reef. — Capt. Wharton. 
Makata has a central volcanic peak, according to the Narrative of Chal- 
lenger Voyage (p. 487), and is surrounded by a barrier-reef, or one inter- 
mediate between that and a fringing-reef. The shore line suggests 
