24 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
Makongai is edged with a fringing reef. The islands in the Makongai 
lagoon are in the northeast corner close to the#astern face of the outer 
reef. The lagoon has a general depth of from thirteen to seventeen 
fathoms, with a greatest depth of twenty-one fathoms in the northern 
part. The southern part of the lagoon is full of coral patches, remnants 
of islands and islets similar to those of the small island of Tambaka, still 
connected with Makongai by a neck of boulders, which reaches to the 
westward as an extensive flat, and fringed below low water mark with 
flourishing patches of corals. Such a patch with a few angular blocks 
= SaaS S— 
LEDGE OFF MAKONDRANGA. 
still visible above high water mark, lies off the southwest point of 
Makondranga, and many others off the southeastern face of Makongai. 
Corals within the lagoon grow in from seven to one or two fathoms. 
The rest of the bottom of the lagoon consists of coral and coralline 
sand. 
Makongai and Wakaya are connected by a narrow reef ridge about a 
mile in length. The island of Wakaya is nine miles long, triangular in 
shape, tapering to a point, and situated close to the western edge of the 
outer reef of the lagoon. A fringing reef edges its eastern face, while 
the extension of the outer reef forms the wider fringing reef of the 
western shore. ‘Towards the south this part of the fringing reef encloses 
two secondary lagoons, one of which has a depth of five fathoms. The 
southern part of the outer reef is continuous ; the northeastern face is 
broken by several passages, and there are three to the north of Wakaya 
on the western face. The highest point of Wakaya is nearly 600 feet, 
forming a range of steep bluffs along the northern part of the island, 
which slopes very gradually to the east. The southern part of the island 
