JOURNAL OF THEMarine Biological Association

OF THE UNITED KINGDOM

New Series VOLUME XVII, No. 2 1931

CONTENTS1. NOTES ON THE BIOLOGY OF CERTAIN LAMELLIBRANCHS ON THE

SCOTTISH COAST. By A. C. STEPHEN. With 15 Figures in the Text.2. ON THE EFFECT OF THE SEVERE WINTER OF 1928-1929 ON THE

OYSTER DRILLS (WITH A RECORD OF FIVE YEARS OBSERVATIONSON SEA-TEMPERATURE ON THE OYSTER-BEDS OF THE BLACK-WATER ESTUARY). ByJ. H.ORTON. With 2 Figures in the Text.

3. OBSERVATIONS AND EXPERIMENTS ON SEX-CHANGE IN THEEUROPEAN OYSTER (O. EDULIS). Part II. ON THE GONAD OF EGG-SPAWNING INDIVIDUALS. By J. H. ORTON and C. AMIRTHALINGAM. With 12Figures in the Text.

4. THE MUDS OF THE CLYDE SEA AREA. III. CHEMICAL AND PHYSICALCONDITIONS; RATE AND NATURE OF SEDIMENTATION; AND FAUNA.By H. B. MOORE. With 11 Figures in the Text.

5. THE SPECIFIC IDENTIFICATION OF FAECAL PELLETS. By H. B. MOORE.With 6 Figures in the Text.

6. RAYS AND SKATES OF DEVON AND CORNWALL. METHODS OF RAPIDIDENTIFICATION ON THE FISHMARKET. By G. A. STEVEN. With 10 Figuresin the Text.

7. TUBE FORMATION IN POMATOCEROS TRIQUETER L. By H. FAOUZI.With 3 Figures in the Text.

8. THE LARVAE OF THE PLYMOUTH GALATHEIDAE. II. GALATHEA SQUA-MIFERA AND GALATHEA INTERMEDIA. By M. V. LEBOUR. With 1 Figurein the Text and Plate I.

9. THE VERTICAL DISTRIBUTION OF MARINE MACROPLANKTON.X. NOTES ON THE BEHAVIOUR OF SAGITTA IN THE PLYMOUTHAREA. By F. S. RUSSELL. With 8 Figures in the Text.

10. THE LOWER LIMITS OF PERCEPTION OF ELECTRICAL CURRENTSBY FISH. By H. C. REGNART.

11. SOME OBSERVATIONS ON SCHOOLING IN FISH. By G. M. SPOONER.With 12 Figures in the Text.

12. THE VALIDITY OF SINGLE VERTICAL HAULS OF THE INTER-NATIONAL NET IN THE STUDY OF THE DISTRIBUTION OF THEPLANKTON. By A. C. GARDINER. With 2 Figures in the Text.

13. THE DETERIORATION OF FABRICS EXPOSED ON A ROOF AFTERTREATMENT WITH FISHING-NET PRESERVATIVES. By W. R. G. ATKINS.

14. NOTE ON THE CONDITION OF THE WATER IN A MARINE AQUARIUM.By W. R. G. ATKINS.

15. ON THE COLORIMETRIC DETERMINATION OF pH IN SEA-WATER. ByO. GOMEZ IBASEZ. With 2 Figures in the Text.

16. ON ABNORMAL CONDITIONS OF THE GILLS IN MYTILUS EDULIS.Part II. STRUCTURAL ABNORMALITIES, WITH A NOTE ON THEMETHOD OF DIVISION OF THE MANTLE CAVITY IN NORMALINDIVIDUALS. By D. ATKINS. With 27 Figures in the Text.

17. NOTE ON SOME ABNORMALITIES OF LABIAL PALPS AND FOOT OFMYTILUS EDULIS. By D. ATKINS. With 7 Figures in the Text.

18. NOTE ON THE REGENERATION OF THE GILL OF MYTILUS EDULIS.By D. ATKINS. With 8 Figures in the Text.

19. THE NATURAL HISTORY OF BULLA HYDATIS LINN. By N. J. BERRILL.With 1 Figure in the Text.

20. NOTES ON CYANEA CAUGHT IN THE RING-TRAWL IN THE PLYMOUTHAREA DURING THE YEARS 1925-1930. By]F. S. RUSSELL.

21. NOTES ON THE CILIATE BOVERIA STEVENSI1SSEL FROM GALEOMMATURTONI SOWERBY AT PLYMOUTH. By D. L. MACKINNON and H. N. RAY.With 2 Figures in the Text.

22. AN AMOEBA FROM THE INTESTINE OF AN ASCIDIAN AT PLYMOUTH.By D. L. MACKINNON and H. N. RAY. With 3 Figures in the Text.

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THE SOCIETY FOR EXPERIMENTAL BIOLOGYThis Society exists for the promotion of intercourse between experimental biologistswithin the United Kingdom. The Journal of Experimental Biology is the official mediumof publication of the Society. Applications for membership should be addressed to theSecretaries:

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G. P. WELLS, Department of Zoology, University College, London

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