118 BUILETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
already stated, Viwa and Asawa i lau are said to consist of elevated 
limestone. 
The Malolo Islands rise to more than 700 feet. Mana is 240 feet 
NORTHERN END OF MANA. 
high, Mondriki and Monu respectively 590 and 730 feet, and Waia more 
than 1,800 feet. The extension northward of the Yasawa group forms 
a chain of sixteen high islands for a length of fifty miles, which ter- 
minates in the reef of the Kinsilk Islands on the south of Round 
Island Passage, the principal entrance through the Great Sea Reef off 
Vanua Levu. The Yasawa Islands, as well as the islands to the westward 
of the Nandi Waters, are,surrounded by fringing reefs. As will be seen 
from the charts, the reefs are on the western face of the plateau (Plate 3); 
so that the outer reef flats and the chain of inner islands intercept the 
full access of the sea, and corals grow but sparingly inside of that line. 
Suva Reef Flats. 
Plates 5, 24-30, 65, 76. 
Perhaps no reef flats illustrate better the grinding and wearing action 
of the sea than those of the barrier reef, both to the east and west of the 
entrance to Suva Harbor, All the inequalities of surface seem to have 
been levelled off as with a plane, leaving only the shallow pools formed 
by the interstices of the large masses of coral (Plates 28-30). The 
fauna of the surface of these reef flats is comparatively poor in species, 
but abundant in individuals. A large black Ophiothrix, with its disk 
hidden in some crack or corner, trails its arms in all directions, and they 
literally swarm in all parts of the reef. Towards the outer edge they 
are replaced by Echinometra lucunter, the holes and hollow ways of 
which, often over two inches deep, honeycomb the surface, leaving nar- 
