| Summary: | P(論文) In Antarctica, the knowledge of gastropod fauna in the area between the eastern Weddell Sea and 50°E is very scarce. The present study was carried out based mainly on gastropod specimens collected by the Japanese Antarctic Research Expeditions (JARE), and those stored in National Institute of Polar Research (NIPR) collections. Gastropod specimens were collected from five stations in Breid Bay (depth range 271-310 m) and two stations in Gunnerus Bank (depth 280 m and 955 m) with the bottom trawl, and around Syowa Station (0-680 m) with the baited traps, small dredge and by SCUBA diving. Ninety species of 24 families and 44 genera were identified. Among them, seventeen new species and one new subspecies were described. The most diverse family in the present study was the Buccinidae, occupying 19% (17 species) of the total number of species observed. Seventy-eight species were collected in Breid Bay, 12 species in Gunnerus Bank and 10 species from around Syowa Station. As for the geographic distribution, 21 species (23.3%) were collected from only the study area, 32 (35.6%) have hitherto been reported from East Antarctica, three species have been reported from West Antarctica, 24 (26.7%) are circum-Antarctic and 10 species (11.1%) occur in both the Antarctic and Subantarctic regions. New information on the bathymetric distribution of the species was obtained. Among the species studied, 83 species (92.2%) have hitherto been reported from the continental shelf to the continental slope. departmental bulletin paper
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