AGASSIZ: FIJI ISLANDS AND CORAL REEFS, 133 
of nearly 300 feet. At Fulanga (Plate 22) the elevated limestone 
attains a thickness of 360 feet, at Kambara (Plate 22) it is about 
200 feet thick, and at Wangava (Plate 22) it is perhaps over 300 
feet ; these islands may be in part voleanic. Finally, at Vatu Leile, the 
most westerly island we examined, the elevated reef forming the island 
is fully 110 feet thick. 
All this plainly shows that the western and southern part of Viti Levu, 
as far south as Vatu Leile, and the whole length of the windward islands 
of the Fiji group, from Ngele Levu on the north to Ongea on the south 
(Plate 2), have been subject to an elevation of at least 800 feet ; and there 
is abundant proof that the greater part of the thickness of the elevated 
coralliferous limestone has been eroded so as to reduce it in certain 
localities to the level of the sea, or in others to leave the bluffs and 
islands and islets of limestone which we have traced at so many points. 
Unfortunately there are as yet but few soundings among the islands 
of Fiji (Plate 2). There is a line extending from Nanuku Passage 
to the Kandavu Passage, and a number of soundings to the north of 
Wailangilala and towards Thikombia, which have developed the ex- 
istence of an extensive plateau with a depth of between 300 and 400 
fathoms, from which rise all the islands forming the northeastern ex- 
tremity of Fiji (Plate 2). The soundings between Ngau and Viti Levu 
(Plate 2) also indicate shallower water to the west of that island than 
is found either east or south of it. The deep water extends northwesterly 
in the passage, parallel with Kandavu. Deep water (1,200-1,700 fathoms) 
is found in the triangle formed by Moala, Totoya, and Matuku (Plates 
2,16), showing the steep slope of Moala, from 1,200 fathoms at a distance 
of six miles, and of Matuku of 1,400 fathoms at a distance of five miles. 
The deep channel passing through the centre of the Koro Sea (Plate 
2) gradually deepens towards the south until it attains a maximum 
depth of over 1,400 fathoms east of Nairai and Ngau, becoming shallower 
towards Viti Levu (Plate 12). The water gradually deepens also in 
the Kandavu Passage from over 1.100 fathoms north of North Astrolabe 
Reef to over 1,900 fathoms southwest of Kandavu. The soundings to 
the north of Naitamba indicate a ridge with somewhat over 500 fathoms 
in depth connecting the plateaus on the two sides of Nanuku Passage 
(Plates 2,18). There are no soundings showing the depths between 
the larger clusters composing the Lau or eastern group of Fiji. It 
would add greatly to our knowledge of the connection of these groups to 
have lines of soundings connecting the different island clusters of Lau. 
All the evidence to be gathered in Fiji tends to prove that preceding 
