156 A HANDBOOK FOR SOUTHPORT. 



Cellepora pumicosa. Very common, growing on other corallines, 

 stones, and sea-weed ; it forms little patches on the stems 

 of Plumularia falcata, Sertularia abiettna, and various 

 other species, appearing like little pieces of white coral, 

 often slightly tinged with rose colour. 



Lepralia. This genus, of which there are from forty to fifty 

 British species, is found on every shore, encrusting shells, 

 stones, zoophytes, and almost every substance thrown 

 ashore by the waves. The forms are very elegant, but 

 being in all cases microscopic, do not receive the general 

 attention the beauty of their appearance deserves. 



Cellularia scruposa (Creeping Stony Coralline). Common on 

 shells, corallines, flustra, and the larger sea-weeds. A 

 small species, but interesting for the microscope. 



Cellularia reptans (Creeping Coralline). Very common on the 

 same substances and in similar situations to the preceding. 



Cellularia plumosa. A large species, often several inches in 

 height, much branched, and frequently found on our 

 shore on the recess of the tide. 



Membranipora pilosa. Grows abundantly on other corallines; 

 we have it on Cellularia scruposa, Plumularia falcata, 

 Sertularia abietina, and various others. 



Membranipora membranacea. Common ; often investing Flus- 

 tra foliacea. 



Flustra foliacea (Broad-leaved Horn-wrack). This very com- 

 mon zoophyte is noticed by all visitors to the shore, 

 where it is mistaken for a kind of sea-weed. It is of a 

 pale sandy colour, differs considerably in the shape and 

 size of the fronds, and abounds in parasites of various 

 kinds, among which are several other species of Flustra. 



