84 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



doubtful forms from my list, although I have added an 

 appendix (I) in which these are enumerated, together with 

 the reasons which lead me to suppose that they are very 

 doutfully natives to our area. 



The rapid development of our knowledge of the mor- 

 phology and life history of Marine Algae renders necessary 

 many alterations in classification and nomenclature. I 

 have followed the nomenclature and classification used in 

 Messrs. Holmes and Batters' recently published list of the 

 Marine Algae of Britain.* 



At first I fancied that an appendix containing records of 

 new species and localities, together with abstracts of any 

 observations I had been able to make on certain forms, 

 would meet the present case, but I soon found that 

 scarcely a single line of my former and provisional list 

 expressed precisely what I wished to say with regard to 

 the species therein enumerated, and, moreover, that the 

 additional notes which I desired to insert were so numer- 

 ous that I felt that it would be much the better way to 

 reprint the entire list, introducing these alterations and 

 additions in their proper places. Where I have altered 

 the name of a species in accordance with more recent 

 views as to its affinities, I have given as well the name 

 (within brackets) by which I designated it in my previous 

 paper. Save in these and other special cases I have not 

 given synonyms nor references to literature. It seemed 

 to me unnecessary to do so, seeing that these are given in 

 full in such easily accessible works as Hauck's Meeres- 

 algen, Kjellman's Alga of the Arctic Sea, Farlow's New 

 England Alga, &c. 



I have added, with certain necessary modifications, the 

 artificial key to the genera of Marine Algae, appended to 



* Annals of Botany, vol. v.. p. 63. 



