APPENDIX. 201 



to be corally, and the island itself is formed of coral-rock. 

 Forster, however, distinctly {Observations ; p. 14) classes 

 it with high islands having reefs, but it certainly is not 

 encircled by a barrier-reef; and the younger Forster ( Voyage, 

 vol. i. p. 426) says, that "a bed of coral-rocks surrounded 

 the coast towards the landing-place." I have therefore 

 classed it with the fringed islands and coloured it red. 

 The several islands lying N.W. of Tongatabou, namely, 

 Anamouka, Ko?nango, Kotou, Lefouga, Foa, etc., are seen 

 in Capt. Cook's chart to be fringed by reefs, and several 

 of them are connected together. From the various state- 

 ments in the first volume of Cook's third voyage, and 

 especially in the fourth and sixth chapters, it appears that 

 these reefs are of coral-formation, and certainly do not 

 belong to the barrier class ; coloured red. — Toufoa and 

 Kao, forming the western part of the group, according to 

 Forster have no reefs ; the former is an active volcano. — 

 Vavao. There is a chart of this singularly formed island, 

 by Espinoza : according to Mr. Williams it consists of 

 coral-rock : the Chevalier Dillon informs me that it is not 

 fringed ; not coloured. Nor are the islands of Latte and 

 Amargura, for I have not seen plans on a large scale of 

 them, and do not know whether they are fringed. 



Niouha, 16 S., 174 W., or Keppel Island of Wallis, or 

 Cocos Isld. 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., 17 6° W., a chart and view of this 

 island in Wallis's Voyage (4to edit.) shows that it is 

 encircled. A view of it in the Naut. Mag., July 1833, 

 p. 376, shows the same fact; blue. 



