SOME NEW BRITISH MARINE ALG^R. » 



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 ColcBone)na, which I have founded on the parasite on Bonne- 

 maisonia. 



Chantransia cecspitosa {Callithamnion cmspitosum J. Ag. Spec. Aly. 

 xi. p. 18; Crn. Al(j. bmist. 121). On Codmm tomentosiun, i'uci, &c. 

 Bwauage, April, 189'J, A'. M. Holmes. I have compared Mr. 

 Holmes's specimens with No. 121 in his copy of Crouan's AUjues 

 Mannes du Finistere, and find the two plants precisely similar. 

 Prof. J. Agardh {Analecta Alyolorjica, p. 48) thinks this may be the 

 same as C. coryinbifera Thur. ; but Crouan's plant is a much larger, 

 coarser plant, with filaments frequently 24 /x in diameter, of a quite 

 diflerent habit, and no trace of either antheridia or cystocarps. 

 From C. Daviedi the present species may at once be distinguished 

 by the pseudo-parenchymatous basal disc of that species being 

 replaced by creeping filaments. 



C. mic IOSCO pica l^'oshe, Contrib. i. p. 54. On Porphyra, 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. Aly. ii. p. 15). 

 On JDesmarestia aculeata, iSwanage, August, 1894, E.A.B. 



Folysiphonia opaca Zan. tiyn. p. 6i3 ; J. Ag. Spec. Aly. p. 1055. 

 Mr. E. D. Marquand records this species from Guernsey {Trans- 

 actions of the (iuernsey [Society of Natural Science, 1894), but I 

 have had no opportunity of verifying the record. 



Bhodochorton jiallens Hauck, Meeresaly. 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 algse, 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. But. Zeitschrift, 1878, p. 187, tab. ii. figs. 4-0). 



Callithamnion lepadicola J. Ag. Spec. Aly. hi. p. 12. On limpet- 

 shells, fcSwanage, August, 1894, E. A. B. My specimens of this 

 plant agree well with the specimens in the British Museum copy of 

 VVelwiisch's Fhyc. Lusitan. No. 23, on which the species is founded, 

 but 1 must contess that the plant appears to be more nearly related 

 to the Banyiacew than to the CeramiecB. I beheve i have seen 

 specimens of this species from Guernsey, but I cannot be certain, 

 as I now have no specimen from that locality. 



Bonnemaisonia luunifera Hariot, Liste des Algues Marines rap- 

 portes de Yokaska (Japon), par M. le Dr. iSavatier, in Me\n. dela Sue 

 Nat. des Sc. ^'at. dx. de Cherboury, xxvii. 1891, p. 223. Mr. Buiiham 

 exhibited a specimen of this very interesting alga, which he had 



