On two Antarctic species of Oswaldella Stechow, 1919: O. shetlandica Stepan'yants, 1979 and O. elongata spec. nov. (Cnidaria Hydrozoa) (notes on Antarctic hydroids, 2). Zoologische Mededelingen (Leiden), 69(15-29), 29 December 1995: 341-351. 347 [Zoological Record Volume 133]