W. WEST AND G. S. WEST ; ALGA-FLORA OK YORKSHIRE. 223 



INDEX. 



In this Index, which has been compiled by Mr. W. DiiNisoN Roebuck, 

 F. L. S. , are given all names of classes, orders, sub-orders, families, sub- 

 families, genera, sub-genera, species, sub-species, varieties, and forms, with 

 most of the specific synonyms, but no attempt is made to discriminate in 

 the Index between species, varieties, and synonyms, nor to indicate the 

 authorship of the various names. In short, the Index is simply an Index 

 of Names. 



