22 6 
APPENDIX. 
and appears to have been much encroached on by the low 
land surrounding the central mountains ; these facts show 
that time has allowed much detritus to accumulate ; 
coloured pale blue. — PouynipUe or Seniavine. In the greater 
part of the circumference of this island, the reef is about 
one mile and three quarters from the shore ; but on the north 
side it is five miles distant from the included high islets. 
The reef is broken in several places ; and just within it, 
the depth in one place is 30 fathoms, and in another, 28, 
beyond which, to all appearance, there was ‘ un port vaste 
et sur’ (Lutke, vol. ii. p. 4). Coloured pale blue. — Hogoleu 
or Boug. This wonderful group contains at least 62 islands, 
and its reef is 135 miles in circuit. Of the islands, only a 
few, about six or eight (see Hydrog. Description, p. 428, of 
the Voyage of the Astrolabe, and the large accompanying 
chart taken chiefly from that given by Duperrey) are high, 
and the rest are all small, low, and formed on the reef. 
The depth of the great interior lake has not been ascer- 
tained ; but Captain D’Urville appears to have entertained 
no doubt about the possibility of taking in a frigate. The 
reef lies no less than 14 miles distant from the northern 
coasts of the interior high islands ; seven miles from their 
western sides, and 20 from the southern : the sea is deep 
outside. This island resembles on a grand scale the 
Gambier group in the Low Archipelago. Of the low 1 
islands forming the chief part of the Caroline Archipelago, 
all those of larger size (as may be seen in the Atlas by 
Captain Lutke), and some even of the small ones of which 
plans are given in the Atlas of the Coquille's Voyage, are 
true atolls. There are, however, some low, small islands 
of coral formation, namely, Ollap, Tamatavi, Bigali, 
Satahoual, which do not contain lagoons ; but it is probable 
that lagoons originally existed, but have since filled up : 
1 In D’Urville and Lottin’s chart, Pescrare is written with capital 
letters ; but this evidently is an error, for it is one of the low islets on 
the reef of Naraonouyto (see Lutk6’s charts), which is a regular atoll. 
