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The annelids here described were collected by the writer in Fiji and Samoa in April, May, and June of 1920, on an expedition conducted by the Department of Marine Biology of the Carnegie Institution of Washington, Dr. A. G. Mayor, Director. Owing to our short stay in Fiji, collecting there was limited to the immediate vicinity of the Suva and was mainly done on the reefs on either side of the main entrance to the harbor and on the mud flats near the city front.
In Samoa, a very thorough survey was made of the harbor of Pago Pago in Tutuila, so that so far as the Leodicidae are concerned this work can claim to be exhaustive for that locality. Only a few annelids from other families were collected and none equaled the Leodicidae in number of species or abundance. The Leodicidae occur especially in the reef rocks and are not represented in the mud of the upper harbor. Apparently this is due to the large quantities of fresh water which flow into the upper end of the harbor, making a brackish-water condition in which only a few Terebellids and Capitellidids can live. I found a similar condition at Fagaalu and on the opposite side of the island in the harbor of Leone. Collections were also made in the lagoon southwest of Nuuli and in the reef west of the island of Aunuu.
The specimens were narcotized in a solution of MgSO4, 153 grams to the liter, killed in 10 per cent formalin, and preserved in strong alcohol.