UlvacecE^ confeeva. 319 



Hab. On rocks near low-water mark. 



On the coast of Ayrshire it is found at mid-tide level, and 

 it is so rigid that it stands erect when left by the tide. It 

 is not common, though widely dispersed. 



3. Conferva ^rea, Billwyn, 



Hab. On sand-covered rocks at mid-tide level. 



This resembles the preceding, but it is smaller, less rigid, 

 and of a yellower green. They are well figured together in 

 Phyc. Brit. PI. xcix. 



4. Coxperva LiNUM, Both. 



Hab. In salt-water ditches near the coast. 



This species has usually been called C. crassa, but it is 

 now found that C. Linum and crassa are the same. ATe 

 have got it abundantly in brackish water ditches at Troon. 

 See it and C. sutoria figured together in Phyc. Brit. PI. cl. 



Pamily XX. ULVxVCE^E. 



" Befoi'e me lay the sea ; 

 Broad heaving billows murmur'd carelessly. 

 O'er wave-ribb'd sands, with lulling peaceful sound ; 

 M'liile snow-white sea-gulls sailed athwart the sky. 



