ISSUED BY THE RAY SOCIETY. 1 

II. Letters of John Ray. Edited by E. Lankester, 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 Sixty 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 Seventu Year, 1850. 
I. Bibliographia Zoologiz et Geologiz. 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 Etcutu 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. 
