308 BRITISH SEA-WEEDS. [CldorosjjermecE. 



Hab. On rocks- in the sea, and in rock-pools near hic^h- 

 water mark. Perennial. Said to be common on all the 

 British shores, but we do not think that it is so on the 

 western shores of Scotland. My friend Dr. Curdic, now in 

 Australia, sent it to rae from the island of Gigha, off Kin- 

 tyre. AVe know that it was got by Mr. W. Thompson at 

 Ballantrae, in Ayrshire. Dr. Greville mentions that it was 

 found by Miss Hutchins in lona. We procured it once in 

 Arran, betwixt Brodick and Corrie, in a rock-pool; but 

 these are all the Scottish habitats that we know of. 



It is not beautiful, but it has .an uncommon appearance, 

 more like a sponge than an Alga. It clings so firmly to the 

 rock that it requires some efibrt to detach it. I was grati- 

 fied by finding Cod'mm tomentosuM, which I had never 

 before seen, except in a dried state; but I was still more 

 pleased with what I saw upon it. On taking it out of the 

 water, I observed a greenish gelatinous animal on it, which, 

 without examination, I cast into the pool again, that it 

 might contiime to enjoy life. I afterwards saw two more, 

 and observing that they were beautifully mottled with azure 

 spots, I placed them in my vasculum, along with some 

 branches of the Codium y ^wii on afterwards putting them 

 into a tumbler of sea- water, I found that I had got a rare 



