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s- 



TRANSACTIONS OF THK YORKSHIRE NATURALISTS UNION 



^TtlTr 27, 



ISSUED TO MEMBERS FOR THE YEAR I9OI. 





THE 



C^ • Zr-o'c: *'■ 



OCT n S^'-" 



ALGA-FLORA OF YORKSHIRE: 



A COMPLETE ACCOUNT OF THE KNOWN 



FRESHWATER ALG/E OF THE COUNTY. 



W. WEST, F.L.S., 



An Ex-President of the Yorkshire Naturalists' Union ; 



AND 



G. S. WEST, B.A., A.R.C.S., 



Hutchinson Research Student, and formerly Scholar of St. John's College, 



Cambridge ; Professor of Natural History at the Royal 



Agricultural College, Cirencester. 



CONTENTS 



OF Fourth Lnstalment (Five Sheets). 



Class BACILLARIEyE— 



Order Raphidie^e (13 genera) .-. 

 Order Pseudoraphidie.e; (8 families) , 

 Order Cryptoraphidie/e (2 families) . 



Addenda (Cosmarium and Tetragonium) 



Numerical Summary 



Index 



Title-Page and Half-Title 



PAGES. . 



165—190 

 J 90 — 216 

 2 16 — 219 

 220 

 221 — 222 

 223—239 

 1—4 



LEEDS : 



PRINTED F"OR THE YORKSHIRE NATURALISTS' UNION 

 BY TAYLOR BROTHERS. 



JULY, I9OI. 



