SOME NEW BRITISH MARINE ALGiE. 9 found it plentifully on specimens of Bonnemaisonia gathered at Berwick several years previously. Had I not seen Mr. Brebner's specimens, I certainly should not have ventured to describe the genus Colaonema, which I have founded on the parasite on Bonne- maisonia. Chantransia ccBspitosa [Callithamnion ccBspitosum J. Ag. Spec. Alg. xi. p. 18 ; Crn. Alg. Finist. 121). On Codium tomentosuni, Fuci, &c. Swauage, April, 1899, E. M. Holmes. I have compared Mr. Holmes's specimens with No. 121 in his copy of Crouan's Algues Marmes du Finistere, and find the two plants precisely similar. Prof. J. Agardh {Analecta Algologica, p. 48) thinks this may be the same as C corymbifera Thur. ; but Crouan's plant is a much larger, coarser plant, with lilaineiits frequently 21 /a in diameter, of a quite dilierent habit, and no trace of either antheridia or cystocarps. From C. Daviesii the present species may at once be distinguished by the pseudo-parenchymatous basal disc of that species being replaced by creeping filaments. C. rnicroscopica i'oslie, Contrib. i. p. 54. On Forphyra, Berwick- on-Tweed, June, 1895, E. A. B. My specimens of this interesting little species, which is at once recognisable by its unicellular basal disc, bear both antheridia and cystocarps in addition to the mono- spores. The antheridia form very compact clusters at short intervals along the mam axes and branches, the cystocarps are clustered near the basal disc, and are very large in proportion to the tiny plant that bears them. C. mirabilis {Callithamnion mirabile J. Ag. Spec. Alg. ii. p. 15). On Besmarestia aculeata, Swanage, August, 1894, E. A. B. Folysiphonia opaca Zan. Syn. p. 63 ; J. Ag. Spec. Alg. p. 1055. Mr. E. D. Marquand records this species from Guernsey [Trans- actions of the (iuernsey bociety of Natural Science, 1894), but I have had no opportunity of verifying the record. Rliodochorton palieris Hauck, Meeresalg. p. 69. Seaton, Devon- shire, July, 1895. I owe to the generosity of my friend Mr. T. H. Butiham, to whom I am indebted for many valuable speci- mens of our native algae, and for still more valuable advice and criticism, a beautiful tetrasporic specimen of this interesting plant, which was gathered by his daughter at Seaton last July. The Devonshire specimen exactly agrees with Hauck's description and figures {Oesterr. Bot. Zeitschri/t, 1878, p. 187, tab. ii. figs. -4-6). CalUthamnion iepadicula J. Ag. Spec. Alg. lii. p. 12. On limpet- shells, Swanage, August, 1894, E. A. B. My specimens of this plant agree well with the specimens in the British Museum copy of Welwiisch's Fkyc. Lusitan. No. 23, on which the species is founded, but 1 must confess that the plant appears to be more nearly related to the Bangiacea than to the Ceramiece. I believe 1 have seen specimens of this species from Guernsey, but I cannot be certain, as 1 now have no specimen from that locality. Bonnemaisonia hanti/era Hariot, Liste des Algues Marines rap- portes de Yokaska (Japon), par M. le Dr. Savatier, in Mem., dela Sue. Nat. des Sc. Nat. dc. de Cherbourg, xxvii. 1891, p. 223. Mr. Bufi'ham exhibited a specimen of this very interesting alga, which he had
