20 THE MARINE ALG/E OK ESSEX. 



Ceramiacese. 

 SPERMOTHAMNION, Aresch. 

 Spermothamnion turner!, Aresch., " Phyc. Scand.," p. 113. 

 Var variabik, J. Ag., " Spec. Algar," ii., p. 24. On the stems of 

 FurceUaria fastigiata, Laniour. Clacton, E. A. B. There are some 

 loose specimens of this species in Mr. Hope's collection, but no 

 locality is mentioned. 



GRIFFITHSIA, Ag. 



Griffithsia setacea, Ag., " Syn. Algar. Scand.," p. xxviii. 

 Walton, 1867, E. (i. Varenne ; Felixstowe and Harwich, (i. P. 

 Hope, E. M. Holmes, and (i. Massee; Clacton, E. A. B. This 

 species is very abundant at Felixstowe in some seasons. In June, 

 1893, Mr. Massee informs me, it was "by far the most abundant 

 weed on the coast." 



G. corallina, Ag., " Syn.," p. 28. Dovercourt, August, 1882, 

 T. H. Buffham. 



HALURUS, Kutz. 



Halurus equisetifolius, Kiitz., " Phycol. General.," p. 374. 

 Felixstowe and Harwich, (r. P. Hope. 



PLEONOSPORIUM, Nag. 



Pleonosporium borreri, Nag., " Sitzungsb. d. k. bayer. Akad. 

 d. \\'issensch. zu Miinschen," 1861, p. 342. Felixstowe Pier (young 

 plants), (i. P. Hope. 



RHODOCHORTON, Nag. 



Rhodochorton rothii, Nag., " Sitzungsb. d. k. bayer. Akad. 

 d. Wissensch. zu Miinschen," 1861, ii., p. 358. Dovercourt Pier, 

 "forming a carpet on the steps below low-water mark," (i. P. Hope : 

 Clacton, E. A. B. 



R. fioridulum. Nag., " Sitzungsber. d. k. bayer. Akad. d. 

 AVissensch. zu Miinschen," 1861, ii,, p. 358. " Below low-water mark, 

 forming carpet to stone steps of Dovercourt Breakwater, June, 

 1883," G. P. Hope. 



CAELITHAMNION, Lyngb. 



Callithamnion polyspermum, Ag., "Spec. Alg.," ii., p. 169. 

 Harwich, July, 1882, G. P. Hope. 



C. roseum, Ag., "Spec. Alg.," ii., p. 164. Southend, July, 1890, 

 Mrs. T. H. Buffham. 



