130 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
It is very probable that this plateau off the southwest coast of Vanua 
Levu represents the denuded and eroded slope of its western coast when 
it once extended ‘near to the 100 fathom line. The only remnants of 
this former extension are the islands of Namena, Passage Island, and 
the numberless rocks and coral patches studded over the surface of the 
plateau and found along its edge. 
The reefs of Makongai and Wakaya represent a stage of denudation 
and erosion less advanced than that of the Namena Reef, and of the reefs 
extending towards Vatu i ra Channel north of Makongai Channel. 
From Cape Undu south the shores of Vanua Levu on both sides of 
Nateva Bay (Plate 4) are bordered by a fringing reef. From Savu Savu 
Bay the south shore is also protected by a fringing reef, which extends 
as far as Fawn Harbor; from there the fringing reef becomes a narrow 
barrier reef at a short distance from the shore, passing round Vienne Bay, 
and forming the Kioa Reefs, and the Florida and Texas reefs on the outer 
edge of the plateau upon which are the islands of Kioa and Rambe (Plates 
4,18). The horn of the Texas reef extends about five miles beyond 
Rambe, and returns to form a fringing and barrier reef on the north 
shore of that island, and connects with the barrier reefs off Kumbalau 
Point. 
The Rambe Plateau (Plates 4,18), as we may call the eroded eastern 
extension of Navukau Promontory, is another admirable example of the — 
mode of formation by submarine erosion of such plateaus as those off the 
southwest coast of Vanua Levu, off the eastern point of Kandavu, and 
off the east face of Taviuni. The island of Rambe rises to a height of 
over 1,500 feet ; it is nearly nine miles long, and about four and a half 
broad (Plate 18). Like Kioa, the other large island on the plateau, 
which is over 900 feet high, it is of volcanic structure. The plateau 
upon which these islands rise, and the accompanying islets, rocks, and 
patches, has a greatest depth of thirty-five fathoms, and an average 
depth of about twenty. 
The Rambe plateau and the one to the east of Taviuni (Plates 4,18), 
from which rise Ngamia and Lauthala, show more plainly than either 
Makongai or Wakaya the former connection with the larger islands of 
Vanua Levu and Taviuni. The promontory of which Cape Undu is.the 
termination would, if denuded and eroded, have resulted in the formation 
of a plateau spit similar in all respects to that constituting the Namena 
barrier reef off the south coast of Vanua Levu. And finally the further 
disintegration of such irregularly shaped islands with encircling reefs as 
those of Makongai and Wakaya (Plate 15) would give us a ready ex- 
