: TRANSACTIONS OF THK VORKSHIRE-, NATURALISTS' UNION. 

 PART 2*?, 

 ISSUED, TO MEMBERS FOR THE YEAR 190I. 



THE 



ALGA-FLORA OF YORKSHIRE: 



_ ' A COMPLETE ACCdUNT OF THE itNOWN 



FRESHWATER ALG/E- OF THE COUNTY. 



W. WEST, F.L.S., 



An .Ex-President of the ■Yorkshire Naturalists' Union ; 

 AND 



-:a RAWEST, B.A., A.E.C.S., , > 



Hutchinson Res'e^ch Student, and formerly Sc^iolar of St, John's College* 

 Cambridge ; Professor of Natural History at the Royal 



Agricultural College, eirericester. " 



CONTENTS 



,: OF .Fourth Instalment (ifiyE Sheets). 



-bv- ,;--- Class Bacillarie/e-^ 



• ''-' Order RaehidiejE (13 genera) ... 



Order PiEuDORAPHiDiEjE (8. families) . 

 Order Cryptoraphidie« (2 families) . 

 Addenda (Cosmariutii and Tetragonium) 

 ;;'NuitERicAE Summary ...... 



Index , ... :.. ... ■; .... 



'Title-Page and Half-Title .... . 



LEEDS: " ' 



PRINTED I'OR THE YORKSHLRE NATURALISTS' .UNION 

 -BY TAYLOR BROTHERS. 



JULY, i9or. 



