Bryozoa of the United States Navy's 1947-1948 Antarctic Expedition, I-IV. I. Barentsia discreta. II. Family Cellariidae. III. Sclerodomidae. IV. Families Umbonulidae and Smittinidae. Proceedings of the United States National Museum, 105(No. 3358) 1956: 221-317. [Zoological Record Volume 93]