Contents {com.) Page 



C. E. Lucas: External metabolites in the sea 139 



P. L. Kramp: a revision of Ernst Haeckel's determinations of a collection 



of Medusae belonging to the Zoological Museum of Copenhagen 149 



J. N. Carruthers: Some very simple devices for various oceanographical uses 169 



J. E. G. Raymont: The fauna of an inter-tidal mud flat 178 



Frances L. Parker: Distribution of planktonic Foraminifera in some Mediter- 

 ranean sediments 204 



L. H. N. Cooper: Hypotheses connecting fluctuations in Arctic climate with 



biological productivity of the English Channel . 212 



Gordon A. Riley: Review of the oceanography of Long Island Sound 224 



A. K. Totton: Development and metamorphosis of the larva of Agalma 



elegans (Sars) (Siphonophora Physonectae) 239 



Charles J. Fish: Observations on the biology of Microsetella norvegica 242 



R. S. Wimpenny: The production of Lisa ramada (Risso) in Lake Mariut, Egypt 250 



JoHAN T. Ruud: The mortality rates of Antarctic fin whale stocks 257 



Alfred Sherwood Romer: Fish origins — fresh or salt water? 261 



E. Steemann Nielsen: The production of antibiotics by plankton algae and 



its effect upon bacterial activities in the sea 281 



John H. Welsh : On the nature and action of coelenterate toxins 287 



Henry C. Stetson: Patterns of deposition at the continental margin 298 



Ruth D. Turner : Scaphopods of the Atlantis dredgings in the Western 

 Atlantic with a catalogue of the Scaphopod types in the Museum of Com- 

 parative Zoology 309 



A. G. Huntsman: Effect of freshets on Passamoquoddy plankton 321 



R. B. Montgomery: Characteristics of surface water at Weather Ship J. 331 



Hans Pettersson: Manganese nodules and oceanic radium 335 



BosTWiCK H. Ketchum and D. Jean Keen: The accumulation of river water 



over the continental shelf between Cape Cod and Chesapeake Bay 346 



viii 



