EAST-INDIAN ARCHIPELAGO. 
241 
Forrest (Voyage, p. 21) states that one of tlie islands near 
Sooloo is surrounded by coral-rocks ; but there is no dis- 
tant reef. Near the S. end of Basselan, some of the islets 
in the chart accompanying Forrest’s Voyage appear fringed 
with reefs ; hence I have coloured, though unwillingly, parts 
of the Sooloo group red. The sea between Sooloo and 
Palawan, near the shoal coast of Borneo, is interspersed with 
irregular reefs and shoal patches ; not coloured : but in the 
northern part of this sea there are two low islets, Cagayanes 
and Cavilli, surrounded by extensive coral-reefs ; the breakers 
round the latter (Horsburgh, vol. ii.p. 513) extend five or six 
miles from a sand-bank, which forms the only dry part ; these 
breakers are steep to outside : there appears to be an open- 
ing through the reef on one side, with four or five fathoms 
within : from this description, I strongly suspect that 
Cavilli ought to be considered an atoll ; but, as I have not 
seen any chart of it, even on a moderately large scale, I 
have not coloured it. The islets off the northern end of 
Palawan are, like those off the southern end, fringed by 
reefs, some way distant from the shore, but the water is 
exceedingly shallow ; uncoloured. The western shore of 
Palawan will be treated of under the China Sea. 
Philippine Archipelago. — A chart on a large scale 
of Appoo Shoal, which lies near the S.E. coast of Mindoro, 
has been executed by Captain D. Ross : it appears atoll- 
formed, but with rather an irregular outline; its diameter 
is about ten miles ; there are two well-defined passages 
leading into the lagoon ; close outside and all round the 
reef, there is no bottom with 70 fathoms ; coloured blue. — 
Mindoro : the N.W. coast is represented in several charts 
as fringed by a reef ; and Luban Island is said by Horsburgh 
(vol. ii. p. 43G) to be ‘lined by a reef.’ — Luzon: Mr. 
Cuming, who has lately investigated with so much success 
the Natural History of the Philippines, informs me that 
a length of about three miles of the shore northward of 
