SOME NEW BKITISH MARINE ALGiE. 7 



list therefore deals only with the recent additions to the Myxophycea 

 and Florideat. I am greatly indebted to M. Gomont, of Paris, for 

 assistance with the M;/.voph>/ce(e, and owe the identification of the 

 first six species recorded below to his kindness. 



Myxophyce^. 



Lynghya Arjardhii Gomont, Monogr. des Oscillariees, p. 144. 

 Calothrix Agardhii Crn. Liste des Alg. Mar. Finist. in Bull. Soc. 

 Bot. de France, vii. p. 372. Margate, on Folysiphonia nigrescens, 

 October, 1894, W. Boyd, Esq. Plymouth, Dec. 1895, G. Brebner. 

 In the autumn of 1894 my friend Mr. W. Boyd was good enough 

 to send me, in a fresh state, a quantity of sea-weed gathered at 

 random on the sliore at Margate, amongst which I was fortunate 

 enough to find this interesting Lyngbyd. 



L. Meneghiniana Gom. in Morot, Journal de Botanique, iv. p. 354, 

 1890. Firth of Forth, opposite Caroline Park, August, 1887. This 

 and the above-mentioned L. Agardhii are the only British repre- 

 sentatives of the subgenus Leibleinia, composed of epiphytic species, 

 in which the filaments are attached by the middle, both ends being 

 erect. L. gracilis must, for the present at any rate, be deleted from 

 the List of British Algae, for M. Gomont informs me that L. 

 gracilis of Holmes's Algm Britannicm Rariores Exsiccata, No. 165 

 (vide Grevillea, xxii. p. 51), is but a form of Oscillatoria CorallincB 

 Gom. The same fate must befall L. confervoides, the plant so 

 called in Grevillea, I.e., being in M. Gomont's opinion a form of 

 L. semiplena. 



L. Fdvulariarum Gom. Monogr. des Oscill. p. 168. Studland 

 and Swanage, Sept. 1894. In the sheaths of Microcoleus chthono- 

 plastes, rare, E.A.B. 



Fhormidium tenne Gom. Monogr. des Oscill. p. 189. Muddy 

 estuary of the Tweed, Oct. 1883, E.A.B. 



P. ambiguum. Gom. /. c. p. 198. In deep rock pools near high- 

 water mark, Farhind Point, Cumbrae, August, 1891, E. A. B. 



P. uncinatum Gom. in Morot, Journal de Botanique, iv. p. 355, 

 1890. Muddy estuary of the Tweed, July, 1884. Ballachuhsh, 

 July, 1885, Dr. Otto Nordstcdt (vide Grevillea, xxii. p. 52). I am 

 uncertain whether Dr. Nordstedt's specimens were gathered in 

 brackish or fresh water; there is, however, no doubt about my 

 Berwick specimens. 



F. corium Gom. in Morot, Journ. de Bot. iv. p. 355. Burnham, 

 May, 1894, T. H. Buffham. In crevices of rocks near high-water 

 mark. Swanage, Sept. 1894, E.A.B. 



P. 2^ersicinum Gom. Monogr. p. 184. Lyngbya piersicina Reinke, 

 Algenflora der West. Ostsee, p. 91. On old Solen shells dredged from 

 6-8 fathoms, Cumbrae, August, 1891, E.A.B. Plymouth, Oct. 

 1895, G. Brebner. 



Floride^e. 



Erythrotrichia Boryana Berthold, Bangiaceen, p. 25. East- 

 bourne, June, 1889, E.A.B. My specimens of this species are 

 narrower than in the typical form, usually being from 18 to 120 p. 



