58 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
of Lafa, one of the Loyalty Group, east of New Caledonia, in the South 
Pacific Ocean.’ The paper contained no analyses, but consisted mainly 
of a short description of this raised coral island, some parts of which 
have been elevated to a height of 250 feet, while a terrace at the level 
of 80 feet marked a pause during the elevation. The author stated 
that the corals from the highest part of the island were altered 
and decomposed, while those near the sea level were quite fresh and 
unchanged. 
In the year 1880 Prof. A. Liversidge* published an account of five 
analyses of some specimens from the South Sea Islands. These included 
two specimens, — one of a coral from the New Hebrides, the other of 
a coral limestone from Duke of York Island, both collected im sztw. 
In the analyses the constituents were expressed as oxides, but if the 
amounts of calcium and magnesium are given as carbonates, they are 
rendered more comparable with my own analyses, and are approximately 
as follows : — 
Reef-coral, New Hebrides Coral-rock, Duke of York Island 
Calcium carbonate. . . . . 97.54 Calcium carbonate . . . . 98.025 
Magnesium carbonate. . . . sly Magnesium carbonate . . . 1.808 
Sodium chloride. . ... . 1.02 SOGB aicd pediamrcls ec eu eom eee 848 
Sillcavews-. te ame kioeek Mice. Pete 12 Potash! 2... 725002 heaton .983 
Alumina and iron sesqui-oxide 23 SiliGal i? a5: Sate wearer eee 789 
Hygroscopic moisture. . . . .26 Alumina and iron sesqui-oxide 1.973 
Orzanicimatter a) case) el eee 500 
Hygroscopic moisture .. . 012 
99.94 99.938 
Mr. W. O. Crosby has given a very interesting sketch of the elevated 
coral reefs of Cuba.? He noted that the older parts of the island con- 
sist of eruptive rocks and slates, that a series of fringing reefs invests 
the island at various levels up to nearly 2000 feet, and that the highest 
and oldest reef is no less than 1000 feet thick. 
In 1885 Mr. H. B. Guppy read a paper before the Royal Society of 
Edinburgh * on the structure of the Solomon Islands, based on a con- 
siderable personal survey of the group. He described the islands as 
usually having a volcanic peak as a nucleus; over this was found a 
1Q.J.G.S. 1847, Vol. IIL, p. 61. 
2 Royal Society of N. S. W., October 6, 1880. 
8 Proceedings of Boston Society of Natural History, 1883, Vol. XXII, pp. 124— 
1380. 
4 Transactions Royal Society of Edinburgh, 1885, Vol. XXXII, pp. 545-581. 
