7s 
AGASSIZ: FIJI ISLANDS AND CORAL REEFS. 113 
Moturiki is connected with the barrier reef stretch opposite its eastern 
face. There is also a similar connection between the fringing reef off 
Bololo Point and the barrier north of Na lulu entrance. The south- 
eastern part of the reef off Ovalau and Moturiki being ‘strictly neither a 
barrier nor a fringing reef, but a combination of the two, the Ngava and 
Na lulu entrances forming reef harbors similar to those characteristic of 
fringing reefs, indicating how the offshore platform of Ovalau has been 
eroded and how corals have gradually obtained a footing on the un- 
derlying volcanic substructure, remnants of which are visible at many 
points of the barrier reef flats. One may judge of the extent of the 
denudation and erosion which have taken place from the shape of the 
peaks and bluffs and ridges which give to Ovalau so characteristic a 
profile when seen from the sea (Plates 33, 34). Compare the sharp 
peak of Tumuna, the rounded elevations forming the ridge of Ndelai 
and of Koro Levu, the sugar loaf of Craig, and the bluffs near Levuka. 
LEVUKA. 
The spur which has formed the island of Moturiki is covered by low 
conical hills, culminating on the eastern summit at Ului Mboa, which is 
but little higher than the rest of the island. 
To the westward and northward of Ovalau reach the extensive flats 
full of patches which connect the west shore of Ovalau with the mainland, 
and reach on the northwest to Tova and south towards Mban (Plate 7); 
flats which are formed by the disintegration of the low bluffs, consisting 
of bedded volcanic mud (“soapstone”), which must once have extended 
eastward close to Ovalau and Moturiki. The patches on the flats are 
covered with growing corals. 
VOL, XXXIII, 8 
