ISSUED BY THE RAY SOCIETY. 23 



II. Letters of Jolin Eay. Edited by E. Laiikester_, M.D., 



F.R.S. Two Plates. 8vo. 



III. A Monograph of the British Nudibranchiate Mollusca. 

 By Messrs. Alder and Hancock, Part IV. Twelve Plates. 

 Imp. 4to, 



For the Sixth Year^ 1849. 



I. Reports and Papers on Vegetable Physiology and Botanical 



Geography. Edited by A. Henfrey, F.R.S. Three Plates. 



8vo. 



II. A Monograph of the British Entomostracous Crustacea. 



By W. Baird, M.D., F.R.S. Thirty-six Plates. 8vo. 



For the Seventh Year, 1850. 



I. Bibliographia Zoologise et Geologise. By Professor Agassiz. 



Vol. II. 8vo. 



II. A Monograph of the British Nudibranchiate Mollusca. 



By Messrs. Alder and Hancock. Part V. Fifteen Plates. 

 Imp. 4to. 



For the Btghth Year, 1851. 



I. A Monograph of the British Angiocarpous Lichens. By the 



Rev. W. A Leighton, M.A. Thirty Plates. 8vo. 



II. A Monograph of the Family Cirripedia. By C. Darwin, 



M.A., F.R.S. Vol.1. Ten Plates. 8vo. 



