42 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
eastern spit of Vanua Levu, which breaks up into Kioa and Rambe Islands 
and the reef-bound platform from which they rise (Plate 4). 
On the platform of submarine denudation and erosion Namena and 
Vatu i thake Islands, as well as a few isolated rocks on the western edge 
of the southeastern horn of the Vanua Levu Barrier Reef are the only 
remnants of the former southern extension of Vanua Levu. To the 
southeast of this must have existed a dumbbell-shaped island of consid- 
erable height, of which only the summits of Makongai and of Wakaya 
are left (Plate 3*). 
The island of Taviuni is, with the exception of the shore fringing the 
northern half of the island and of the point of reefs off Vuna Point, 
destitute of reefs. The island is about 23 miles long, from five to eight 
broad, sloping uniformly to the shores from the backbone of the island. 
This rises to a height of over 4,000 feet. The main ridge sends off a few 
spurs towards the northeastern face of the island. The fringing reef 
attains its greatest width to the east of Naiselesele Point. It encloses 
a few small volcanic islets, varying in height from 60 to 90 feet, and the 
somewhat larger island of Mbuimbani (Plate 60), lying to the south, and 
which rises to a height of more than 400 feet. To the south the fringing 
reef becomes again quite narrow, and disappears at Laveine Point. 
Immediately north of Somo Somo Strait the submarine platform 
widens. Koro Levu Islet and Phillips and McPherson Rocks are in- 
cluded within shallow soundings covered with reef patches running out 
from the west shore of Taviuni. At a somewhat greater distance from 
the west shore of Tavinni within the 50 fathom line are Champion, 
Breaknot, and Maté Rocks, and to the northeast of Naiselesele Point the 
submarine platform reaches its greatest width, the Gangway Rocks and 
the bank connected with them being the most distant of the outliers of 
Taviuni. 
To the eastward of Taviuni lie the islands of Ngamia, Lauthala, and 
Matangi, separated from Taviuni by the Tasman Strait. The plateau 
from which these islands rise is really the extension of the shoal lying 
to the east of Taviuni and the outer reef which extends from Matangi 
east of Lauthala and south of Ngamia, stretching across Tasman Strait 
in disconnected patches and joining the fringing reef off Thurston 
Point. To the westward of Matangi the outer reef extends only in 
broken patches, and is seen also in the many disconnected patches found 
in the western part of Tasman Strait. Between Matangi and the 
northeastern horn of the outer reef there are two passages across it. 
The lagoon enclosing Ngamia and Lauthala has a greatest depth of forty 
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