EEVISED LIST OF MARINE ALG^. 



121 



Appendix III. 



I have subdivided the coastline of the district into 

 four sections : — (1) The Mersey and Dee Estuaries, (2) 

 Hilbre L, (3) Anglesea and Puffin L, (4) I. of Man. The 

 first is characterised by mud flats and sand banks with 

 occasional rocks ; Hilbre Island has many forms not 

 found in the estuary which prefer caves and rock shelves ; 

 Anglesea and Puffin I. have a rich flora, the coastline 

 being precipitous and more favourable to Rhodophycese 

 and Phseophycese, whilst the I. of Man is peculiar on 

 account both of its isolated position and also of its 

 climate, which permits of an approximation of northern 

 and southern forms. 



Map of the L. M, B. C. District. H, Hilbre I. ; P, Puffin I. (The island 

 itself is not marked) ; D, Douglas ; R, Ramsey ; E, Port Erin ; C, Calf of Man. 



The tables of distribution indicate only records of ob- 

 served occurrence, and are not to be taken as indicating 

 negative as well as positive distribution, 



