APPENDIX. 211 



Ireland^ New Hanover, and the small islands lying northward, 

 I have been unable to obtain any information. I will 

 only add that no part of New Ireland appears to be fronted 

 by distant reefs. I have coloured red only the above speci- 

 fied portions. 



New Britain and the Northern Shore of New 

 Guinea. — From the charts in the Voyage of the Astrolabe, 

 and from the Hydrog. Memoir, it appears that these coasts 

 are entirely without reefs, as are the Schouten islands, lying 

 close to the northern shore of New Guinea. The western and 

 south-western parts of New Guinea, will be treated of when 

 we come to the islands of the East Indian Archipelago. 



Admiralty Group. — From the accounts by Bougainville, 

 Maurelle, D'Entrecasteaux, and the scattered notices col- 

 lected by Horsburgh, it appears, that some of the many 

 islands composing it are high, with a bold outline; and 

 others are very low, small and interlaced with reefs. All 

 the high islands appear to be fronted by distant reefs rising 

 abruptly from the sea, and within some of which there is 

 reason to believe that the water is deep. I have therefore 

 little doubt they are of the barrier class. — In the southern 

 part of the group we have Elizabeth isld., which is sur- 

 rounded by a reef at the distance of a mile ; and two miles 

 eastward of it (Krusenstern, Append., 1835, p. 42) there is 

 a little island containing a lagoon. — Near here, also, lies 

 Circular-reef (Horsburgh, Direct., vol. i. p. 691, 4th edit.), 

 " three or four miles in diameter, having deep water inside 

 with an opening at the N.N.W. part, and on the outside 

 steep too." I have from these data, coloured the group pale 

 blue, and circular-reef dark blue. — The Anachorites, Eche- 

 quier, and Hermites, consist of innumerable low islands of 

 coral-formation, which probably have atoll-like forms ; but 

 not being able to ascertain this, I have not coloured 



