PACIFIC OCEAN. 
221 
of the reefs fronting this island ; coloured blue. 1 — Santa, 
Cruz : I have carefully examined the works of Carteret, 
Dentrecasteaux, Wilson, and Tromelin, and I cannot dis- 
cover any mention of reefs on its shores ; left uncoloured. 
— Tinahoro 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 
intertwined with reefs. I do not believe they include a 
lagoon ; I have left them uncoloured . — Duff s Islands com- 
pose a small group directed in a N.W. and S.E. band ; they 
are described by Wilson (p. 296, Miss. Yoy. 4to edit.) as 
formed by bold peaked land, with the islands surrounded 
by coral reefs, extending about half a mile from the shore : 
at the distance of a mile from the reefs he found only seven 
fathoms. As I have no reason for supposing there is deep 
water within these reefs, I have coloured them red. — Kennedy 
Island, N.E. of Duff’s: I have been unable to find any 
account of it. 
New Caledonia.— The great barrier-reefs on the shores 
of this island have already been described (Fig. 5, Plate II.). 
They have been visited by Labillardiere, Cook, and the 
northern point by D’Urville ; this latter part so closely 
resembles an atoll that I have coloured it dark blue. The 
Loyalty group is situated to the east of New Caledonia; 
some at least of the islands are formed of upraised coral- 
rock, and are fringed with living reefs ; see Rev. W. B. 
Clarke, in Journal of Geolog. Soc. 1847, p. 61 ; coloured 
red. North of this group there are some extensive low 
reefs (called Astrolabe and Beaupr6 2 ), which do not seem 
to be atoll-formed : these are left uncoloured. 
1 [This island has a barrier-reef, with a 4-fathom channel through 
it, which leads into a harbour in the island itself. There is also 
deep but uneven water generally inside the reef.— Lieut. Chas. Smith, 
H.M.S. Fawn.] 
2 [This is an atoll. — Capt. Wharton.] 
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