ARTICLES Robert J. Ellis and Natasha I. Calvin: Observations on the 1975 class of Laminaria gruenlandica and incidental ecological observations, southeastern Alaska, 1975–80 Mary Needler Arai and John C. Mason: Spring and summer abundance and vertical distribution of Hydromedusae of the central Strait of Georgia, British Columbia B. Robinson, M.C. Feller and K. Klinka: Four common mosses as indicators of forest floor acidity in the Coastal Western Hemlock Zone of southwestern British Columbia Beverly A. Kask, John R. Sibert and Barbara Windecker: A check list of marine and brackish water harpacticoid copepods from the Nanaimo estuary, southwestern British Columbia D.J. Garbary, L. Golden and R.F. Scagel: Capsosiphon fulvescens (Capsosiphonaceae, Chlorophyta) rediscovered in the northeastern Pacific] Matthew H. Dick and Irving M. Warner: Pacific sand lance, Ammodytes hexapterus Pallas, in the Kodiak island group Alaska Daphne Fautin Dunn: Paraphelliactis pabasta, a new species of hormathiid sea anemone from abyssal northeastern Pacific waters (Coelenterata: Actiniaria) Sandra C. Lindstrom, Michael J. Wynne and Natasha I. Calvin: Pleonoporium pedicellatum sp. nov. and notes on Pleonosporium spp. (Rhodophyta, Ceramiaceae) from Alaska Notes Edward A. Black: Southward extension of the known range of the masked greenling, Hexagrammos octogrammus (Pallas 1811), with a note on congeneric species caught in the Queen Charlotte Strait area Natasha I. Calvin: Occurrence of Omphalophyllum ulvaceum Rosenv. (Phaeophyta, Pogotrichaceae) in the North Pacific