ISSUED BY THE RAY SOCIETY. 21 



LI. Letters of John Ray. Edited by E. Lankester, M.U., 



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

 III. A Monograph of the British Nudibranchiate Mollusca. 



By J. Alder and A. 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. 



Vpl. II. 8vo. 



II. A Monograph of the British Nudibranchiate Mollusca. 



By J. Alder and A. Hancock. Part V. Fifteen Plates. 

 Imp. 4to. 



FOR THE EIGHTH 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. I. Ten Plates. 8vo. 



