REVIEW OF THE GENUS PLACIPHORELLA DALL, 1879, EX CARPENTER MS (POLYPLACOPHORA, MOPALIIDAE) WITH DESCRIPTIONS OF 2 NEW SPECIES

The genus Placiphorella Dall, 1879, ex Carpenter MS is reviewed. Nine species are recognized: P. velata Dall, 1879, ex Carpenter MS; P. rufa Berry, 1917; P. blainvillei (Broderip, 1832); P. mirabilis sp. nov.; P. hanselmani sp. nov.; in the eastern Pacific, P. borealis (Pilsbry, 1892); P. stimpsoni (Gould, 1859) and P. boreali-japonica Saito & Okut ani (1989) in the western Pacific; and P. atlantica (Verrill & Smith, 1882) a bathyal-abyssal, cosmopolitan species. Each species is describ ed and illustrated, and its habitat and distribution are discussed. Th e conspecificy of P. atlantica and P. pacifica Berry, 1919, is demonst rated, and its broad geographic distribution is discussed.