1918] MACCAUGHEY—HAWAIIAN ALGAE 45 
KAUAI AND OAHU 
Of the larger eastward islands, Kauai and Oahu are of particu- 
lar note, as they have the largest coral reefs and support the most 
luxuriant marine flora. The reefs are all of the fringing and plat- 
form types, and vary in width from a few hundred feet to half a 
mile. Reefs are well developed along the southern or leeward 
shores of the two islands, and also, to a less degree, along the 
northern coasts. Oahu is practically encircled by coral, whereas 
Kauai has numerous coastal stretches entirely free from coral. 
The little island of Niihau, to the west of Kauai, has considerable 
coral reef. There are a number of regions along the Oahu coast 
which are especially favorable for collecting marine algae and for 
the study of their ecology. These are (1) the Waikiki region, 
between Honolulu Harbor and Diamond Head ; (2) the Pearl 
Harbor region; (3) the Coral Plain and reef south of Ewa, between 
Pearl Harbor and Barber’s Point; (4) the Waianae coast, which 
has extensive and well protected reefs; (5) the Wai-alua coast, 
which is not as well protected as that of Waianae; (6) the Kahuku 
region, with large sandy beaches and shoals; (7) the Ka-hana 
region, with drowned valleys and crescentic beaches; (8) Kane-ohe 
Bay, a beautiful body of water, 8 miles long and 3 miles wide, 
filled with coral islands and shoals; (9) Kai-lua and Wai-manalo, 
with lovely coral beaches and reefs; (10) the Koko Head and 
Mauna Loa district, with broad reef platforms half a mile wide. 
Most of the collecting by visiting algologists (TILDEN, SCHAUINS- 
LAND, BERGGREN, etc.) was done along the Waikiki reefs, and also 
at Waianae. It has been the privilege of the author to visit repeat- 
edly all of the reefs enumerated. 
The following popular account? of a visit to a coral reef will 
serve to indicate the general features of this interesting life region. 
Arriving at a suitable location, where the water was only two or three feet 
deep, Wwe anchored the canoe and prepared for wading. We were equipped 
With old shoes to protect our feet from the jagged, broken coral branches 
(which cause very painful and slow-healing wounds); with broad-rimmed hats 
‘0 protect eyes, face, and neck from the intense glare of the sun and water; 
> MacCavcuey, VaAuGHAN, Coral reefs of the Hawaiian Islands. Jour. Geog. 
74:252-255. 1916; also A survey of the Hawaiian coral reefs, in press. 
