42 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
11. Levuka. Specific gravity, 2.8. Very compact andesite agglom- 
erate, almost identical with (8). 
Mr. W. E. Woolnough, B. Sc. of Sydney University, has kindly ° 
examined and described No. 12. 
No. 12. Suva. Specific gravity, 2.84. Olivine dolerite. 
Plagioclase by far the most abundant constituent of the rock, making 
it almost andesitic. They take the form of large tabular crystals with 
abundant concentric-zoned inclusions, mainly magnetite and a little 
apatite. The zoning is very perfect. Augite is present in large yellow 
idiomorphic crystals showing twinning and traces of ophitic structure. 
The olivine present is a highly ferriferous variety, some of the crystals 
being blood-red. Most of the olivine is in the form of large grains, some 
show distinct outlines. Some of it is almost undecomposed, while some 
is almost opaque with secondary serpentine and iron-oxides. 
The magnetite recurs in scattered grains, and is distributed abundantly 
throughout the ground mass, which is crypto-crystalline to glassy in 
texture. In one cavity there is a mass of small spherulites of a zeolite. 
These give under crossed nicols a dark cross at about 30° with the prin- 
cipal planes of the nicols. 
13. Mango. Specific gravity, 2.75. Selected from compact andesite 
flow. Shows the usual structure and appearance of plagioclase. The 
pyroxenes are altered; some show beautiful 8-sided crystals. Much 
magnetite present. 
14. Taviuni. Specific gravity, 2.70. Selected from vesicular andesite. 
Under microscope shows two crops of felspar in glassy base. Great 
development of magnetite. 
15. Taviunt. Specific gravity, 2.72. Vesicular olivine basalt. The 
olivines are quite fresh. Crop of lath-shaped felspars. 
16. Munia. Specific gravity, 2.70. Taken from an andesite agglom- 
erate. Dark-colored rock showing usual two crops of plagioclase in fine 
base. Pyroxenes are altered. 
The following three rock slides were described by Mr. W. E. Wool- 
nough, B. Se., of Sydney University. 
17. Loma Loma. Specific gravity, 2.92. This appears to be a coarse 
dolerite with phenocrysts of striated felspar, and apparently greenish 
pseudomorphs after olivine. 
18. Suva. Specific gravity, 2.57. A rhyolite. 
Groundmass is crypto-crystalline, containing abundant grains of 
limonite, also containing very abundant small spherulites which are 
quite free from lJimonite. 
