20© APPENDIX. 



margin of its upper surface fringed with reefs; hence it 

 cannot be properly classed with atolls, in which the founda- 

 tions are always supposed to lie at a depth, greater than 

 that at which the reef-constructing polypifers can live ; not 

 coloured. 



Beveridge Reef, 20 S., 167 W., is described in the 

 Nairt. Mag. (May 1833, p. 442) as ten miles long in a 

 N. and S. line, and eight wide ; " in the inside of the reef 

 there appears deep water ; " there is a passage near the 

 S.W. corner: this therefore seems to be a submerged atoll, 

 and is coloured blue. 



Savage Isld., 19 S., 170 W., has been described by 

 Cook and Forster. The younger Forster (vol. ii. p. 163) 

 says it is about forty feet high : he suspects that it contains 

 a low plain, which formerly was the lagoon. The Rev. J. 

 Williams informs me that the reef fringing its shores, 

 resembles that round Mangaia ; coloured red. 



Friendly Arch. — Pylstaart Isld. : judging from the 

 chart in Freycinet's At/as, I should have supposed that it 

 had been regularly fringed 3 but as nothing is said in the 

 Hydrog. Memoir (or in the voyage of Tasman, the dis- 

 coverer) about coral-reefs, I have left it uncoloured. — 

 Tongatabou: In the atlas of the voyage of the Astrolabe, 

 the whole south side of the island is represented as narrowly 

 fringed by the same reef which forms an extensive platform 

 on the northern side. The origin of this latter reef, which 

 might have been mistaken for a barrier-reef, has already been 

 attempted to be explained, when giving the proofs of the 

 recent elevation of this island. — In Cook's charts the little 

 outlying island also of Eoaigee, is represented as fringed; 

 coloured red. — Eoua. I cannot make out from Capt. 

 Cook's charts and descriptions, that this island has any 

 reef, although the bottom of the neighbouring sea seems 



