EANGE OF BRITISH SEA-WEEDS. 45 



others, are confined to the southern parts. Others, again, 

 such as the Fuel in general, the Laminariecs, many Deles- 

 serice, some Nitopk7/lla, Laurencice, Gaslridea, and C/iondri, 

 possess too extended a range to be influenced by any change 

 of temperature between the northern Ifoundary of Scotland 

 and England/' 



Even in those that are found only in the north or in the 

 south, we are not always able to account for their abundance 

 in some seasons, and for their scarcity in the same localities 

 in others. The case is the same with Mollusca and Zoo- 

 phytes. Nor can we always account for the abundance of the 

 last-mentioned very interesting creatures in some localities, 

 and their utter absence in others where the climate is quite 

 the same. 



Dr. Weill mentions that on our shores Algse generally 

 occupy zones in the following order, beginning from deep 

 water : — F. filum, esculentus, and bidbosiis ; F. digitatiiSy 

 sacckarinus, andi loreus ; F. serratics ami crispus ; F.nodosus 

 and vesiculosiis ; F. canallculatus ; and, last of all, F.pjg- 

 mmis, which is satisfied if it be within Teach of the spray. 



