THE JOURNAL OF MOLLUSCAN STUDIES SUPPLEMENTS The following supplements to the Journal of Molluscan Studies are available: Supplement 1. V. FRETTER & A. GRAHAM. The Prosobranch Molluscs of Britain and Denmark. Part 1 — Pleurotomariacea, Fissurellacea and Patellacea. 37pp, 25 figs. Price £5. Supplement 2. E. d. B.-R. MARCUS. On the genus Tornatina and related forms. 35pp, 88 figs. Price £5. Supplement 3. V. FRETTER & A. GRAHAM. The Prosobranch Molluscs of Britain and Denmark. Downloaded from https://academic.oup.com/mollus/issue/48/1 by guest on 01 October 2021 Part 2 — Trochacea. 63pp, 49 figs. Price £5. Supplement 4. E. d. B.-R. MARCUS. An Annotated Checklist of Western Atlantic Warm Water . Opisthobranchs. 22pp. Price £5. Supplement 5. V. FRETTER & A. GRAHAM. The Prosobranch Molluscs of Britain and Denmark. Part 3 — Neritacea, Viviparacea, Valvatacea, Terrestrial and Freshwater Littorinacea and Rissoacea. 52pp, 56 figs. Price £5. Supplement 6. V. FRETTER & A. GRAHAM. The Prosobranch Molluscs of Britain and Denmark. Part 4 — Marine Rissoacea. 89pp, 65 figs. Price £5. Supplement 7. V. FRETTER & A. GRAHAM. The Prosobranch Molluscs of Britain and Denmark. Part 5 — Marine Littorinacea. 43pp, 19 figs. Price £5. Supplement 8. P. BOUCHET & A. WAREN. Revision of North-East Atlantic Bathyal and Abyssal Turridae (Mollusca, Gastropoda). 119pp, 221 figs. Price £6. Supplement 9.* V.FRETTER & A.GRAHAM. The Prosobranch Molluscs of Britain and Denmark. Part 6 — Cerithiacea, Strombacea, Hipponicacea, Calyptraeacea, Lamellariacea, Cypraeacea, Naticacea, Tonnacea, Heteropoda. 79pp, 42 figs. Price £6. £3 to members of the Malacological Society. (This half-price offer, extended to members of the Malacological Society only, expires December 1982.) AVAILABLE SUMMER 1982 Supplement 10.* E. d. B.-R. MARCUS. Systematics of the genera of the order Ascoglossa (Gastropoda). 31pp, 72 figs. Price £6. £3 to members of the Malacological Society. (This half- price offer, extended to members of the Malacalogical Society only, will expire one year from date of publication.) Supplement 11.* V. FRETTER & A. GRAHAM. The Prosobranch Molluscs of Britain and Denmark. Part 7 — Heterogastropoda (Cerithiopsacea, Triforacea, Epitoniacea, Eulimacea). Price £6. £3 to members of the Malacological Society. (This half-price offer, extended to members of the Malacological Society only, will expire one year from date of publication.) All prices include postage * Please note: Members taking advantage of the half-price offer are limited to ONE copy only at the special rate. ORDERING INFORMATION Supplements may be purchased direct from the publisher at the following address: ANGUS GRAHAM ASSOCIATES LIMITED, 70-78 Queen's Road, READING RG1 4BP. Telephone: Reading (0734) 52236 Overseas purchasers wishing to pay in a currency other than sterling should add the equivalent of 75 pence sterling to their remittance to cover bank conversion charges. Cash with order is preferred, since this eliminates the time consuming process of issuing a pro-forma invoice. i THE MALACOLOGICAL SOCIETY OF LONDON OFFICERS AND COUNCIL FOR THE YEAR 1982-83 (elected 13 March 1982) President: J.A. ALLEN, D.Sc. Vice-Presidents: P.B. MORDAN, Ph.D. G.E. BEEDHAM, Ph.D. T.E. THOMPSON, D.Sc. E.R. TRUEMAN, D.Sc. (ex officio) ELIZABETH B. ANDREWS, Ph.D. Secretary: A. BEBBINGTON, Ph.D. Department of Science, Bristol Polytechnic, Redland Hill, Bristol BS6 6UZ Treasurer: JENIFER M. PLUMMER, Ph.D. Department of Physiology Royal Veterinary College, Royal College Street, London NW1 OTU Downloaded from https://academic.oup.com/mollus/issue/48/1 by guest on 01 October 2021 Editor: A. GRAHAM, D.Sc, F.R.S. Department of Zoology, University of Reading, Whiteknights, Reading RG6 2AJ Pubjicity Officer: JUNE CHATFIELD, Ph.D. The Gilbert White and Oates Memorial Library, The Wakes, Selborne, Alton, Hampshire Council: K.H. JENNINGS, B.Sc. J.D. TAYLOR, Ph.D. N.J. MORRIS, Ph.D. A.D. BERRIE, Ph.D. J. DAVENPORT, Ph.D. P.G. OLIVER, Ph.D. The Malacological Society of London was founded on 27 February 1893. The Society was registered as a Charity in 1978 (Registration No. 275980) with the Rules which were adopted on 17 May 1978. The objects of the Society are to advance education, research and learning for the public benefit in the study of the Mollusca from both pure and applied aspects. Meetings are held throughout the year. The Annual General Meeting is held in March. Membership is open to all individuals who are interested in the study of molluscs. The annual subscription for 1982 for Private members is £12.00 or S31.20 U.S. & Can.; for Student members £5.00 or $13.00; for Institutional/Library members is £25.00 or $66.60, due on January. Remittances should be drawn in in favour of 'The Malacological Society of London' and sent to the Hon. Secretary with applications or to the Hon. Treasurer with renewals. No receipt will be sent for payments by cheque on members' own accounts at either United Kingdom or United States banks, unless specially requested. Members with accounts at British banks are urged to pay by Standing Order; forms are available from the Hon. Treasurer, United States and Canadian members may pay by Standing Order; forms are available from the Hon. Treasurer. United States and Canadian members may pay by personal cheque. The dollar subscription rates take into account postage and the charges made by the Society's bank for processing foreign cheques. Members are entitled to receive a copy of The Journal of Molluscan Studies, to attend the meetings of the Society, to vote in the election of Council and Officers and are eligible for election to Council and Office. The Journal is issued three times a year, a volume consisting of three parts. The price of a single issue is £10 ($26.00). The annual subscription for non-members is £25.00 ($66.60) post free. Back numbers may be purchased on application to the Editor, but complete series are no longer available. In 1976 the Society started publishing a series of Supplements to the Journal which are available to members at a reduced rate. Orders for Supplements should be sent to: Angus Graham Associates, 70-78 Queen's Road, Reading, RG1 4BP. An Annual Award was also instituted in 1976. The award is given to a person who, in the opinion of the Society's adjudicators, has made an exceptionally promising initial contribution of the study of molluscs. Nominations from any member of the Society must reach the Hon. Secretary by 31 October each year. The Radley Library is available for study in the separate Library for Biological Sciences, Foster Court Building (first floor), University College, London. Further information, with forms of application for membership may be obtained from the Hon. Secretary. Changes of address, typed or in block letters, should be sent to the Hon. Secretary or the Hon. Treasurer as soon as possible. The Journal of Molluscan Studies Volume 48 — Part 1 — April 1982 CONTENTS BRIAN MORTON. Some aspects of the population structure and sexual strategy of Corbicula cf. flum'malis (Bivalvia: Corbiculacea) from the Pearl River, People's Republic of China M.C. PILKINGTON & J.B. PILKINGTON. The planktonic veliger of Amphibola crenata (Gmelin) TERRENCE M. GOSLINER. A new record of the nudibranch gastropod Polycera hedgpethi Marcus, from the Indian Ocean of South Africa MICHEL CORNET. Anatomical description of Vasconiella jeffreysiana (P. Fischer, 1873) (Mollusca, Bivalvia, Leptonacea) T.C. FOIN. Systematic implications of larval shell parameters for the genus Cypraea (Gastropoda: Mesogastropoda) .... J.-F. GRENON & G. WALKER. Further fine structure studies of the "space" layer which underlies the footsole epithelium of the limpet, Patella vulgata L. : W.F. PONDER. The anatomy and relationships of Hydrococcus brazieri (T. Woods) (Mollusca: Gastropoda: Rissoacea) Downloaded from https://academic.oup.com/mollus/issue/48/1 by guest on 01 October 2021 THOMAS E. WISSING, DANIEL J. HORNBACH, MICHAEL S. SMITH, CARL M. WAY & JEFFREY P. ALEXANDER. Caloric contents of corbiculacean clams (Bivalvia: Heterodonta) from freshwater habitats in the United States and Canada S.K. RAUT & K.C. GHOSE. Viability of sperms in aestivating Achatina fulica Bowdich and Macrochlamys indka Godwin-Austen A.N. HODGSON. Some behavioural and electrical responses of Scrobicularia plana (Bivalvia: Tellinacea) to siphonal wounding RESEARCH NOTES H.B. Akberali, E.R. Trueman & M.J. Eamshaw. The influence of external calcium in facilitating copper-induced contraction in the isolated siphon of Scrobicularia plana (Bivalvia), 96; A.C. Brown & E.R. Trueman. Muscles that push snails out of their shells, 97; J.M. Frain& P.F. Newell. Meal size and a feeding assay for Deroceras reticulatum (Mall:), 98; Jenifer M. Plummer & J.B. Bredl. Collateral formation by large fibres in a pallial nerve of Archachatina- electrical and fine-structural evidence, 99; R.G. Aldred, Marion Nixon & J.Z. Young. Possible light organs in finned octopods, 100; Christopher D. Todd. Further observations on the ascoglossan opisthobranch Calliopaea bellula D'Orbigny, 101; CM. Yonge. Mantle margins with a revision of siphonal types in the Bivalvia 102; W.D. Russell-Hunter, Daniel E. Buckley & David W. Aldridge. Recent technical modifications of total organic carbon analyses for molluscan growth studies, 103; V. Fretter. An external vascular opening in Littorina spp., 105. Review 106 Malacological Society of London .- Report of the Council 1982 107 Accounts for the year ended 31 December 1981 108 MALACOLOGICAL SOCIETY OF LONDON Annual subscriptions (for rates see p.3 of cover) fall due on 1 January and should be sent without further notice. Members whose current subscriptions are not fully paid will not receive the Journal. Please ensure that remittances cover the total amount due. Members are requested to notify the Hon. Secretary promptly of any change of address. Published by Angus Graham Associates, 70-78 Queen's Road, Reading, Berks. Printed in England by Eniroform Limited, Reading.