We study a class of preference domains that satisfies the familiar properties minimal richness, diversity and no-restoration. show specific restriction, hybridness, has been embedded in these so preferences are single-peaked at “extremes” unrestricted “middle”. also structure strategy-proof unanimous Random Social Choice Functions on domains. them to be special cases probabilistic fixed ballot ...

Currently, 15 species of Nephtyidae (Annelida) are known from the Sea of Okhotsk (north-western Pacific). A new user-friendly identification key is presented with a brief description for each species. The taxonomic positions of three closely related species, Nephtys brachycephala Moore, 1903, N. schmitti Hartman, 1938 and N. paradoxa Malm, 1874, are revised. The distributions of two species, Ne...