AGASSIZ: FIJI ISLANDS AND CORAL HEEFS. 113 



Moturiki is connected with the bai'rier reef stretch opposite its eastern 

 face. There is also a simihir 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 Xgava and 

 Na lulu entrances forming reef harbors similar to those characteristic of 

 frincino- reefs, indicating how the offshore platform of Ovalau has been 

 eroded and how corals have gradually obtained a footing on the un- 

 derlying volcanic substructui'e, 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 Xdelai 

 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 !\Ibau (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 



