232 BRITISH SEA-WEEDS. \_It7io(los2)crmecE. 



Hab. Submarine rocks near low-water mark. Annual. 

 Winter. Rare. 



This bears some resemblance to the preceding ; but it is 

 a less robust plant. The tubercles are rare and smaller, 

 and the dull purple colour becomes pink in fresh water. 

 It is found in England by Mr. Eashleigh, Mrs. Griffiths, 

 Miss Cutler, and Mrs. Gulson; iu Ireland by Mr. AV. 

 Thompson and Professor Harvey. 



3. GiGARTiNA Teedii, Lamour. 



Hab. On rocks in the sea ; very rare. Perennial. Ellery 

 Gove and Tor Abbey rocks, by Mrs. Griffiths, to whom, as 

 also to the Eev. W. S. Hore, I am indebted for a fine spe- 

 cimen of this rare Alga. 



4. GiGARTiNA MAMiLLOSA, J. Agardh. 



Hab. Eocks in the sea, near low-water mark. Perennial. 

 Autumn and winter. 



This species is as common as the others are rare ; the 

 fronds are from 3-6 inches long, cartilaginous, channelled ; 

 capsules on little stalks scattered profusely over the disc of 

 the frond. We have found it very large in Arran, rolled 

 up in the form of a ball. The finest specimens we have ever 

 got were at Gourock, near Greenock. Till we met with it 

 figured and new-named in ' Phycologia Britaimica,' we re- 



