The concentrations of Co, Ni, Cu, Zn, Cd, Pb, As, Fe, Mn, and Al were determined in sediments and biota of Songkhla Lake, a shallow coastal lagoon located in southern Thailand. In June 2006, surface sediments were sampled in 44 stations in the three sections of the lake (inner-, middle-, and outer sections). Sediment cores were also sampled in 13 stations in three cross-sections of the lake. In surface sediments, trace and major elements, organic matter, sediment grain size analysis, and sulfides were determined, and in the sediment cores, redox profiles were made. Soil samples were also collected at garbage dumping sites in the vicinity of the lake. In addition, the metal accumulation in two catfish species (Arius maculatus and Osteogeneiosus militaris) and the crustacean (Apseudes sapensis) was also investigated. Trace element concentrations in sediments of Songkhla Lake show that, especially the Outer section of the lake, in particular the sediments at

The macrobenthic fauna in Thale Sap Songkhla was investigated at 2-3 month intervals from October 1991 to October 1993. The abundance of the benthic fauna ranged from 53 to 9529 individuals m-2. The abundance and species composition were generally higher during the late southwest monsoon (October) than during the midnortheast monsoon (December). One hundred and twenty-two species belonging to six phyla were found. Three major groups of macrobenthic fauna consisted of 44 species of Polychaeta (36%), 44 species of Crustacea (36%) and 28 species of Mollusca (28%). The other six species (5%) were minor groups belonging mainly to the Nematoda, Oligochaeta, Sipunculida and Pisces (fish larvae). The predominant polychaetes were Diopatra neapolitana and Heteromastus filiformis. Diopatra neapolitana was found only at two stations close to the sea (20-1440 individuals m-2), while H. filiformis was found at all stations (6-2255 individuals m-2). Apseudes sp. 1 (Tanaidacea), Apanthura africana (Isopoda), Amphipoda (many species) and Eupogebia sp. (Anomura) were the main groups of Crustacea. The most abundant crustacean was Apseudes sp. l., with a maximum density of 5726 individuals m-2. The dendrogram of Jaccard's coefficient shows two clusters of communities. An increase of polychaetes was observed in the second year of the study.

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Two new species of the genus Kamaka Dershavin, 1923 (Crustacea: Amphipoda: Kamakidae) are described from Songkhla Lagoon in southern Thailand. Kamaka appendiculata sp. nov. has unique lamellate appendix on peduncle of antenna 2 in adult male. Kamaka songkhlaensis sp. nov. has swelled peduncular article 4 of antenna 2 and wide propodus of gnathopod 2 in adult male. Morphological characters of K. songkhlaensis closely resemble those of K. poppi Bamber, 2003 from Hong Kong and K. taditadi Thomas & Barnard, 1991 from Papua New Guinea, Indonesia and Malaysia; however, K. songkhlaensis can be distinguished from K. poppi by the peduncular article 4 of male antenna 2 without distal spine and the convex distal margin of propodus of male gnathopod 2, and from K. taditadi in the right-angled posteroventral corner of male coxa 1 and the propodus of male gnathopod 2 without blunt triangular process on anterior margin.

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