THE 



TRANSACTIONS 



OF THE 



YORKSHIKE 



NATURALISTS' UNION. 



PART 8. 

 Issued to the Members for the year 1883. 



CONTENTS 



Series C— Invertebrata (exclusive of the Artieulata), Sheet 3. 



Annotated List of the Land and Freshwater MoUusca known to 

 Inhabit Yorkshire (Valvata and Planorbis). 



By William Nelson and John W. Taylor. pp. 33—48; 

 Series D—Articulata— Sheets 8, 9. 



On Some Probable Causes of a Tendency to Melanic Variation 



in Lepidoptera of High Latitudes (Presidential Address for 1884). 



By Lord Walsingham, M.A., F.L.S., &c. pp. 113— 140. 



Series E—BoxANy— Sheets 11, 12, 13. 



The Flora of Ripon and Neighbourhood. 



By Rev. H. H. Slater, M.A., F.Z.S., M.B.O.U. pp. 153—184. 

 ^ , The Fathers of Yorkshire Botany (Presidential Address for 1883). 



WL By John Gilbert Baker, F.R.S., F.L.S. pp. 185—200, 



W. SATCHELL AND CO., 12, TAVISTOCK STREET, W.C. 

 LEEDS: TAYLOR BROS., PRINTERS, HUNSLET NEW ROAD. 



MARCH, l88q. 



