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A new species of pontoniine shrimp, Periclimenes jackhintoni sp. nov., from Tonga is described and illustrated. The new species is most closely related to P. ceratophthalmus Borradaile (Palaemonidae). It is readily distinguished from P. ceratophthalmus, and all other species of Periclimenes, by its unusual sickle-shaped rostrum. The unique specimen was found in association with an unidentified crinoid host.

A 1981 - 1986 survey of the marine fauna of Port Essington, Cobourg Peninsula, Arnhem Land, northern Australia, confirms the presence of 61 species of palaemonoid shrimp. Three new species, Periclimenaeus serrula sp. nov., Periclimenaeus solitus sp. nov., and Periclimenes cobourgi sp. nov., are described, and a further 25 species added to the fauna of the Northern Tenitory, of which Periclimenaeus stylirostris, Periclimenes novaecaledoniae, and Periclimenes sinensis are new records for Australia. This report provides the first general account of the palaemonoid fauna of a larger focal area from northern Australia, and one third of the pontoniine shrimps known to occur in Australian waters are now known to occur in the Port Essington region. The survey has, in total, provided eight species new to science and 34 species have been added to the fauna of the Northern Territory.

A new species of pontoniine shrimp, Periclimenes Jranklini, from 300 m in the Coral Sea, is described and illustrated. The new species occupies an isolated systematic position in the genus Periclimenes as the carapace lacks an antenna! spine, and is closely related only to P. gorgonicola Bruce, from which it differs in the presence of large articulated postrostral spines. Both species suggest that the genus Mesopontonia Bruce, is more closely related to the genus Periclimenes, rather than other genera that lack an exopod in the third maxilliped. Periclimenes franklini is probably also a gorgonian associate.

A new species of Periclimenes (Crustacea: Decapoda: Palaemonidae), from the Indian Ocean and Great Barrier Reef, is recorded. P. gonioporae is primarily associated with scleractinian corals of the genus Goniopora and is closely related to P. mahei Bruce and P. diversipes Kemp. The name has appeared several times as a nomen nudum in the scientific literature since 1976 and is now validated. The distinguishing features of P. gonioporae are described, illustrated and discussed.

A new species of palaemonid shrimp, Periclimenes anacanthus, is described and illustrated. As a species of the "Periclimenes grandis species group", it is most closely related to P. calmani Tattersall or P. ensifrons (Dana) and P. grandis (Stimpson). The species is apparently free-living and associated with Zostera- beds in southern Queensland.

Three new species of commensal caridean shrimps from Port Essington, Cobourg Peninsula Marine Park, Arnhem Land, are described and illustrated. Periclimenes alegrias sp. nov. is associated with the crinoids Stephanometra spicata Carpenter, Lamprometra palmata Muller and Comanthina variabilis Bell; Periclimenaeus orontes sp. nov. with the sponge Jaspis stellifera Carter and Hamopontonia essingtoni sp.nov. with the scleractinian coral Stylophora pistillata (Esper).