SOME NEW BRITISfi MARINE ALG^. ll it seems likely that many more opportunities may arise of con- necting his name with the sea-weeds of Britain. In his recent Analecta Algologica; Continuatio, ii., Prof. J. Gr. Agardh, besides raising the varieties vimineum, corymbosum, and botryocarpum of Ceramium riibrum to specific rank, records three new Ceramia, i. e., C. Crouanianum, C. fruticulosum , and C. ar- borescens from Britain. As the specimens were in most cases sent to Prof. Agardh by Mrs. GrifiBths, we presume the new species were found on the coast of Devonshire or Cornwall. Bhododiscus piilchenimus Crn. Aiin. Sc. Nat. 4th ser. xii. pi. xxii. figs. 29-33. On an old Solen shell, Plymouth, Oct. 1895. I was fortunate enough to find a specimen, now in the Herbarium of the British Museum, of this most interesting plant when examining some old Solen shells from Plymouth Sound, which Mr. George Brebner had sent to me to examine for perforating algae. I trust that before long Mr. Brebner will be able to send me some more specimens of this plant, which perhaps, when specially sought for, may not be so rare as is generally supposed. Peyssonnelia Rosenvingii Schmitz, in Rosenv. Groenlands Ha- valger, p. 782. Near low-water mark, Berwick-on-Tweed, February, 1888. From an examination of the figure and description of this species it appeared to me so probable that this species might be mistaken for P. Harvey ana that I re-examined all my specimens so named, with the result that I actually found one or two specimens of P. Rosenvingii amongst them. P. rubra J. Ag. Spec. Alg. ii. p. 502 ; iii. 386. Birturbui Bay, on the Scallop Bank, August, 1846, William McCalla d Prof. W. H. Harvey. Harvey's figure and description of Peyssonnelia (Cruoriella) Dubyi in Phycologia Britannica always appeared to me so different from that given by the brothers Crouan of their plant, that I was doubtful whether both authors referred to the same species. Through the kindness of Prof. E. P. Wright, I have been enabled to examine Harvey's original specimens, and I have no hesitation in saying that all his Birturbui Bay specimens are referable to P. rnbra. The specimens in the collections presented to Kew and the Linnean Society by Prof. Harvey are also referable to P. rubra. Although there are no specimens from the West of Scotland in any of the collections which belonged to Harvey, I have no doubt that the specimens from that locality mentioned by him in P'hyc. Brit. are referable to Cruoriella Dubyi, a species which is by no means uncommon at Cumbrae and elsewhere on the west coast. P. atropurpurea Crn. Alg. Mar. Finist. 23 ; Florule du Finistere, p. 148. Penzance, August, 1889, A. H. Teague. Cruoria rosea Cm. Fl. Finist. 147. Plymouth, Nov. 26, 1895. Simultaneously detected by Mr. Brebner and myself on old shells dredged from "The Queen's Ground," Plymouth Bay. In conclusion, I may say that Mr. Brebner purposes to publish shortly figures of the species of Colaconema and Trailliella, and that Mr. Buffham similarly purposes to publish a description and figure of Bonnemaisonia hami/era.
