200 BEiTisH SEA-WEEDS. {Tthoclospermece. 



of British Algse. It has been since described and figured 

 in ^ Phycologia Britannica/ PL cxli. It is distinguished by 

 having the coloured dissepiments armed with nmnerous, 

 slender, irregularly inserted, subulate, colourless, one-jointed 

 prickles. 



6. CflahelUr/emm, J. Ag. 8. C. strictum, Grev. & Harv. 



7. — ^^ellucidunij Grev. & H. 



9. Cebamium decurrens, Kiitz. 



In May 1846, when waiting on the quay at Largo, in 

 Fife, for the steamer to convey me to Edinburgh, I em- 

 ployed myself in picking up Algse. Among others, I found 

 a very beautiful specimen of C. decurrens, which about the 

 same time had been observed for the first time in this country 

 by Mrs. Griffiths. I was at a loss whether to call it C. ru- 

 hrum or C. diapJumiun. When the figure of it lately appeared 

 in ' Phycologia Britannica,' I was no longer at a loss. I 

 have since found it in beauty at Ayr. 



10. Ceramium GRACiLLiMUM, Grcv, ^' Harv. 



Tliis beautiful little plant, so far as I know, has not yet 

 been observed in Scotland. I have specimens of it through 

 the kindness of Miss Cutler and Dr. Cocks. It seems inter- 

 mediate between C. diaphannm and C. nodosum. 



11. Ceramium nodosum, Grev. ^ Harv. 



