CermmeceT}^ ceramium. . 201 



Hab. Sandy shores, often at the roots of Zostera marina. 

 Annual. Summer and autumn. 



Though slender, it is rigid, and its forkings are very 

 patent. The tetraspores are in a row, on the outside of 

 the branchlets, and the favellcBj wliich are rare, at the tips 

 of the branchlets. In England, by Mrs. Griffiths and Miss 

 Kirkpatrick; in Ireland, by Miss Ball, Miss Gower, Mrs. 

 Ovens, Professor Harvey, Mr. William Thompson, and 

 Mr. M'Calla. It has been found occasionally floating in 

 Saltcoats Bay, and has also been found on other Algse on 

 the pier- wall at Troon. 



12. Ceramium fastigiatum, Harvey. 



This is a lovely species. The first specimen I ever saw 

 of it was from Mrs. Griffiths, marked very rare. The next 

 specimens were from Dr. Greville and D. L., jun., who got 

 them at Joppa, near Edinburgh. It was first correctly dis- 

 tinguished by Mrs. Griffiths, who found it at Torquay. 

 The filaments are dichotomous and level-topped ; the colour 

 in England is described as dark purple ; in Scotland, the 

 colour is rather light and lively purple. It is decidedly rare. 



13. Ceramium Deslongchampsii, Chauv. 



Hab. On rocks and Algse between tide-marks. Annual. 



