MARINE ZOOLOGY VIII. MOLLUSCA I have not paid special attention to some groups of these animals, and have recorded only such as attracted my attention when collecting others. I must therefore express my thanks to the Rev. Carleton Greene of Great Barford near St. Neots for the list of shells collected by him, and to Mr. Wm. Cole for a list of those collected by Mr. A. Mayfield of Mendlesham. I have also incorporated the species given by Mr. A. Patterson in his paper on the shells collected by him near Great Yarmouth, published in the Zoologist for 15 May 1903, though no doubt some w^ere obtained just outside Suffolk. In giving the following list I combine all these with my own, and express the authority by the initials, viz. G. for Greene, M. for Mayfield, P. for Patterson, and S. for Sorby. The nomenclature is that of the Conchological Society in the Journal of Conchology (1901), No. I, with subsequent corrections by Mr. W. E. Hoyle. Many of my specimens have been examined and identified by Professor Herdman.' I. AMPHINEURA Crasfedochilus cinereus (G., P.) • — • onyx, i Acanthochites fascicular'is, ? II. PELECYPODA {Bivalves) Nucula nucleus (G., P., S.) — nitida (P.) Anamia efhippium (G., M.) Mytilus edulh (G., M., P., S.) Volsella modiolus (G., P.) Modiolaria marmorata (G.) — discors (G.) Ostrea edulis (G., M., P., S.) Chlamys varius (G., M., P.) Mquipecten opercularis (G., P.) Cyprina islandica (G.) Montacuta bidentata (P.) Syndosmya nitida (G.) — alba (G.) — tenuis (G., M.) Scrobicularia plana (G., M., P., S.) Tellina tenuis (G., S.) — fabula (P., S.) Macoma balthica (G., M., P., S.) Donax vittatus (G., P.) Mactra stultorum (G., P., S) Spisula solida (G., P.) — subtruncata (G.) Tapes aureus (S.). In Orwell, rare — puUastra (G.) Cardium exiguum (G., P.) — edule (G., P., S.) Mya arenaria (G., M., P., S.) — iruncata (G., P., S.) Pholas dactylus (G., P.) II. PELECYPODA (cont.) Bnrnea Candida (G., P., S.) — ■ parva (G.) Zirphaea crispata (G.) Teredo navalis (G., P.) III. GASTROPODA PROSO- BRANCHIA {Univalves) Patella vulgata (G., P.) Helcion pellucidum (P.) Acmaea virginea (P.) Gibbula cineraria (G., M., P., S.) — umhilicata (G., M.) Calliostoma zizyphinus (G., M., P.) Lacuna divaricata (G., M., P.) — pallidula (G., P.) Littorina obtusata (G., M., P., S.) ' — rudis (G., M., P.) — littorea (G., M., P., S.) Rissoa parva (G., M., P.) — inconspicua (P., S.) Paludestrina stagnalis (G., M.) Truncate lla truncata (G.) Calyptraea chinensis (G.) Natica catena (G., M., P.) Bittium reticulatum (P.) Odostomia unidentata (P.) Turbonilla lactea (G.) Eulimella commutata (G.) Turritella communis (G., M.) Buccinum undatum (G., M., P., S.) Neptunea antiqua (G., M., P.) Ocinebra erinacea (G., M., P.) Purpura lapillus (G., M., S.) Nassa reticulata (G., M., P., S.) — incrassata (G., M., P.) III. GASTROPODA PROSO- BRANCHIA {cont.) Beta turricula (G., M., P.) - rufa (G., P.) IV. GASTROPODA OPIS- THOBRANCHIA Tetrabranchia Tornatina truncatuk (G., M., P.) — obtuta (G., P.) Haminaea hydatis (G.) Acera bulkta (G., S.) Philine aperta (G., M., S.) NUDIBRANCHIA Facelina coronata (S.). Orwell Fiona marina (S.). Orwell and Stour Acanthodoris pilosa (S.). Stour Goniodoris castanea (S.). Orwell V. CEPHALOPODA Sepia officinalis (G., P.) Sepiola atlantica (S.) — scandica (P.) Loligo media (P., S.) Polypus vulgaris (P.) About 1890 Sepiola atlantica was much more common in the Orwell and Stour than about 1 900, and the same may be said of Loli^ media in the Stour, the numbers of both seeming to de- crease year by year. ' Journ. of Linn. Soc. 'Zoology,' xxiii, no. 148, p. 558. ' A very remarkable variety of this species was found by Dr. Gwyn Jeffreys in the Deben at Shottisham Creek near Sutton and at Manningtree. It was named by him var. crstuarii, and is described and figured by him in British Conchology, vol. v, p. 205, PI. ci, fig. 8 (A.M.N.). 93
