PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B VOLUME 276 BIOLOGICAL SCIENCES 1976-7 PUBLISHED BY THE ROYAL SOCIETY 6 CARLTON HOUSE TERRACE LONDON SW1Y5AG CONTENTS Series B Volume 276 No. 943 30 November 1976 A Discussion on the assembly of regular viruses. Organized by A. K lug, F.R.S. and P. J . G. Butler ..... page 1 No. 944 30 November 1976 Organization of motoneurones in the prothoracic ganglion of the cockroach Periplaneta americana (L.). By J . F. Iles ............. 205 No. 945 7 December 1976 The history of the mammal fauna during the Ipswichian/Last interglacial in England. By A. J . St u a r t ....................................................................................................................... 221 No. 946 25 January 1977 Late-Devensian and Flandrian vegetational history of Bodmin Moor, Cornwall. By A. P. Brown ............. 251 No. 947 25 January 1977 Studies on the eyes of anchovies Anchoa mitchilli and A. hepsetus (Engraulidae) with particular reference to the pigment epithelium. By B. A. Fineran and J. A. C. N icol, F.R .S.................................................................... 321 No. 948 25 January 1977 The nervous system of Loligo III. Higher motor centres: the basal supraoesophageal lobes. By J. Z. Young, F.R.S.................................................................................................... 351 No. 949 25 January 1977 Polymorphism and selection in Cochlicella acuta. By G. Lewis ............. 399 No. 950 11 February 1977 Form and evolution in the Anomiacea (Mollusca: Bivalvia) - Pododesmus, Anomia, , Enigmonia (Anomiidae): Placunanomia , Placuna (Placunidae Fam. Nov.). By C. M. Yonge, F.R.S................................................................................................. 453 Indexes 525 PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON CONTENTS OF VOLUME 276 (SERIES B) No. 943 A Discussion on the assembly of regular viruses. Organized by A. Klug, F.R.S. and P. J. G. Butler £17.05 No. 944 Organization of motoneurones in the prothoracic ganglion of the cockroach Periplaneta americana (L.) ByJ. F. Iles £1.45 No. 945 The history of the mammal fauna during the Ipswichian/ Last interglacial in England. ByA. J. Stuart £1.80 No. 946 Late-Devensian and Flandrian vegetational history of Bodmin Moor, Cornwall. By A. P. Brown £0.00 No. 947 Studies on the eyes of anchovies Anchoa mitchilli and A. hepsetus(Engraulidae) with particular reference to the pigment epithelium. By B. A. Fineran and J. A. A. C. Nicol, F.R.S. £3.80 No. 948 The nervous system of Loligo III. Higher motor centres: the basal supraoesophageal lobes. ByJ. Z. Young, F.R.S. £4.50 No. 949 Polymorphism and selection in Cochlicella acuta. By G. Lewis £3.85 No. 950 Form and evolution in the Anomiacea (Mollusca: Bivalvia) - Pododesmus, Anomiay Patro, Enigmonia (Anomiidae): Placuna- nomia, Placuna (Placunidae Fam. Nov.). By C. M. Yonge, F.R.S. £4.30 Printed in Great Britain for the Royal Society at the University Presst Cambridge.