Welsh Journals

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and 150 animals. The status of Welsh seals and the timing of the breeding season are discussed. It is suggested that there is a south west stock of seals which, excluding any Irish component, amounts to at least 2700 animals and which may be distinct from seal populations breeding further north. REFERENCES ANDERSON. S. S.. BONNER. W. N., BAKER, J. R. & RICHARDS. R., (1974). Grey seals, Halichoerus grypus, of the Dee Estuary and observations on a characteristic skin lesion in British seals. J. Zool. Lond., 174 429-440. BONNER. w. N.. (1972). The Grey seal and Common seal in European waters. Oceanogr. mar. Biol., Annu. Rev., 10 461-507. BONNER. W. W.. (1976). Stocks of Grey & Common seals in Great Britain. N.E.R.C. Publications Series C, No. 16. BOYD. J. M.. LOCKIE. J. D. & HEWER. H. R.. (1962). The breeding colony of Grey seals on North Rona, 1959. Proc. zool. Soc. Lond. 138: 257-277. COULSON. J. c. & HICKLING. G., (1964). The breeding biology of the Grey seal. Halichoerus grypus (Fab.) on the Farne Islands, Northumberland. J. Anim. Ecol. 33 485-512. CRAGGS. J. D. & ELLISON. N. F., (1960). Observations on the seals of the (Welsh) Dee Estuary. Prbc. zool. Soc. Lond. 135: 375-385. DAVIES. J. L.. (1949). Observations on the Grey seal (Halichoerus grypus) at Ramsey Island, Pembrokeshire. Proc. zool. Soc. Lond. 119: 673-692. DAVIES. J. L.. (1953). Colony size and reproduction in the Grey seal. Proc. zool. Soc. London. 123 327-332. DAVIES. J. L., (1956). The Grey seal at the Isles of Scilly. Proc. zool. Soc. Lond. 127 161-166. HEWER. H. R., (1964). The determination of age, sexual maturity, longevity and a life-table in the Grey seal (Halichoerus grypus). Proc. zool. Soc. Lond. 142 593-624. HEWER. H. R.. (1974). British Seals. The New Naturalist, 57. London, Collins. JOHNSON. A. L.. (1959). Seal Marking 1958. Nature in Wales, 5, 716-724. JOHNSON. A. L., (1961). Seal Ringing in West Wales during 1960. Nature in Wales. 7 83-84. LOCKLEY, R. M., (1966a). Grey Seal, Common Seal. London, Andre Deutsch. LOCKLEY. R. M., (I 966b). The seals of Wales and Ireland their distribution and conservation. Nature in Wales, 10 58-64. MATTHEWS. L. H., (1950). The Natural History of the Grey seal, including lactation. Proc. zool. Soc. Lond., 120 763. MATTHEWS, L. H., (1955). Marine Mammals of West Wales. Nature in Wales. I 49-53. SMITH. E. A., (1966). A review of the world's Grey seal population. J. Zool. Lond. 150 463-489. SUMMERS, C. F., (1974). The Grey seal (Halichoerus grypus) in Cornwall and the Isles of Scilly. Biol. Conserv. 6 (4) 285-291. Seals Research Division. Institute for Marine Environmental Research, c/o British Antarctic Survey, Madingley Road, Cambridge.