Abstract
Monoporella projecta sp. nov. from the continental shelf and slope east of the Boso Peninsula, Japan adds to the bryozoan fauna along the northwestern Pacific coast, where more than 10 species of this genus have been recorded. Colonies of this species are uniserial encrusting in growth form, and autozooids are large and much inflated with a projecting orificial rim. These colony and zooidal characteristics may be related to the deep-water environment.