-4At Belle Island, the invertebrates usually sampled were the killer clam Tridacna, the spider snail Lambis, the land hermit crab Coenobita, the black sea cucumber Holothuria atra, and the branching corals Acropora, Porites, Pocillopora, and Heliopora. Fish, and aquatic invertebrates were usually collected along the north or ocean side, algae on the lagoon and ocean sides, land plants in the central portion, land hermit crabs among the bushes of the north edge, and terns nearby. Rats were obtained centrally on Janet Island. Invertebrates and fish were collected at low tide when possible. Biological specimens were put on ice in insulated containers and transported to the laboratory at Elmer Island for immediate preparation or for freezing until time was available for dissection. Soil samples were dried and packaged for shipment. Five- milliliter samples of sea water were dried on 1 1/@-inch stain- less steel plates and ashed, except that in 1956, 100-milliliter samples were used because of the low level of the activity. These were treated with sodium carbonate to remove potassium (K+O contributes about 0.6 disintegrations per minute per milliliter), and then filtered, and the precipitate used for counting. Radiocesitum is also lost by treatment with sodium carbonate (UWFL-46: 10). Plankton was prepared by filtering and removing as much as 1-2 grams to the 1 1/2-inch counting plates, drying, and ashing. From occasional poor tows the wet sample weight was as low as O.1 gram. Portions usually sampled from the invertebrates were: from clams, mantle, adductor muscle, gill, kidney, visceral mass, and shell; from spider snails, mantle, muscle of foot, terminal portions of liver and gut, visceral mass, and shell; from the land hermit crab, gill, digestive gland or liver, gut, carapace, and muscle of leg; from sea cucumbers, gonad when suffictently plentiful, gut and contents, muscle of the body wall, and body wall or integument with or without attached muscle; and from coral the terminal portions of small branches. Shell samples of clams and snails were usually taken from the thin edge to include periostracum. The term gut as used in this report implies any portion of the digestive tract not more specifically designated and includes the contents. Sample size was influenced somewhat by the nature of the sample and the amount of radioactivity present. was low, larger samples were used. When activity Between 50 and 200 milligrams of ash were usually considered desirable, but weights ranged widely, from less than 10 to more than 1000 milligrams. Shell and gut with sandy content were more lightly sampled on 2 wet pu ck y AR :