THK MARINE AI.C.K OK KSSEX. 21 



C. corymbosum, Ag., "Spec. Alg.," ii., p. 165. "Floating 

 over the Deben bar from sea, Sept., 1882," (). P. Hope. 



PLUMARIA, Schmitz. 



Plumaria elegans, Schmitz., in " Flora," 1889, heft. 5. On 

 cement stone rock, Felixstowe and Harwich, (1. P. Hope and G. 

 Massee. 



ANTITHAMNION, Nag. 



Antithamnion plumula, Thur., ap. Le Jolis, " Liste des 

 Alg. Mar. de Cherbourg," p. 112. Estuary of the Orwell and Stour, 

 E. IM. Holmes. 



CERAMIUM, Lyngb. 



Ceramium tenuissimum, J. Ag., "Spec. Alg.," ii., p. 120. 

 Near Harwich, F. ^l. Holmes. 



C. deslongchampsii, Chauv., " Alg. Norm.," No. 83. " Below 

 low-water mark Dovercourt stone pier," and Harwich, G. P. Hope ; 

 Southend, July, 1890, Mrs. T. H. Bufifham. 



C. diaphanum, Roth., "Catal.," iii., p. 154. Cement stone 

 rock, Felixstowe and Harwich, ( 1. P. Hope ; Dovercourt, E. A. B. 



C. rubrum, Ag., "Syn.," p. 60. Maldon, 1844, Walton, 1867, 

 Harwich, 1888, E. G. Varenne ; Felixstowe, G. P. Hope and G. 

 Massee ; Clacton, E. A. B. 



C. flabelligerum, J. Ag., " .\dvers.,"' p. 27. Fort Breakwater, 

 Harwich, G. P. Hope ; Felixstowe, E. A. B. Not uncommon. 



Grateloupiacese. 



(iRATELOUPIA, Ag. 



Grateloupia filicina, Ag., "Spec. Algar,,' i., p. 223. Cement 

 rock at half tide, Felixstowe, G. P. Hope. 



Dumontiaceae, Schmitz. 



DUMONTIA, Lamour. 



Dumontia filiformis, (irev., "Alg. Brit.," p. 165, t. 17. 

 Blackwater Estuary, E. M. Holmes. 



DILSEA, Stack. 

 Dilsea edulis, Schmitz., in "Flora," 1889, p. 453. Harwich, 

 G. P. Hope. 



