TRANSACTIONS OF THE YORKSHIRE NATURALISTS UNION. 



PART 25, 



ISSUED TO MEMBERS FOR THE YEAR iSqQ. 



M^ 



, of Co 



o?n OT ^omp^:^ 



I 0CTliJ94i> 



THE 



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 Third Instalment (Four Sheets). 



Class Chlorophyce^ — 

 Order Conjugate- — 



Family Uesmidiace^b (6 genera) 

 Order SiPHONEiE (2 families) 

 Order Protococcoide^ — 



Family Volvocine^ (7 genera) 

 Family Palmellace^ (49 genera) 

 Class Myxophycea^. — 



Order Hormogone^ (6 families) . 

 Order CHAMiESlPHONACE^E (i genus) 

 Order CHROOCoccoiDEyE (17 genera) 

 Class Bacillarie^ — 



Order Raphide^ (5 genera) 



PAGES. 



lOI III 



112 113 



113— IIS 



115— 137 



137 — 151 



151 



151 — 158 



158—164 



LEEDS : 



printed for the YORKSHIRE NATURALISTS' UNION 

 BY TAYLOR BROTHERS. 



JULY, I90I. 



I; 



