Ski:. GONGYLOSrER]\rE.E. (1:5?,) Fam. CERAMIACE^.. 



GRIFFITHSIA DEVONIENSIS.— iZr/m 



Gen. CiiAii. — " Frond rose-red, filamentous; filaments jointed tlirongliont, mostly dlclio- 

 tomous; ramuli single-tubed ; dissepiments hyaline." Fruotification of two kinds, 

 on distinct plants: 1. FavellEe, siirrounded by an involucre: 2. Tetraspores, 

 attached to whorled " involucral ramuli." Name in honour of Mrs. Griffiths, well 

 known for her numerous and valuable discoveries among British Algte. 



Griffithsia Devoniensis. — Frond gelatinous, very slender, filiform, 

 dichotomous, lower branches patent ; articulations cylindrical, six to 

 eight times as long as their diajneter; teti'aspores attached to the inner 

 edge of whorled, involucral rannili. 



Griffithsia Devoni-ensis.- — Harv. P. i?. plate 16; Ilarv. Man. p. IfiS; Harv> Syn. 

 p. 139 ; Atlas, plate 55, fig. 251; /. G. Ayardh, Sp-. Gen. Alg. vol. ii. 

 p. 79. 



Hab. — Muddy sea-shores, in deep water. Eare. Plymouth {Rev. W. S. Ilore, July, 

 1840) ; Salcombe (Mrs. Wyatt, Sept. 1840).— P/ij/c. Brit. 



Geogr. Dist. ? 



Description. — Fronds capillaceous, much tufted, and regularly dicho- 

 tomoiis, two to four inches long ; branches erecto-patent below, nearly 

 erect above. Articulations of the main branches eight to ten times 

 longer than broad, cylindrical, slightly thickened at each end, and 

 roimded, much shorter upwards, the apices obtuse, quite destitute of 

 whorled ramuli, except the involucres. Tetraspores obovate, triparted, 

 produced on the inner edge, at the apices of the articulations of the 

 involuci'es, which are composed of simple or forked, articulated, incurved 

 ramuli whorled round the apices of the articulations of the main 

 branches. Favellce we have not seen. Substance gelatinous, very 

 flaccid, and closely adhering to paper in drying. Colour, bright rose 

 red, rapidly discharged in fresh water or when exposed to the light 

 while moist. 



This very pretty species has been selected by Dr. Harvey for the 

 purpose of connecting, as he very aptly expresses it, the name of the 

 late Mrs. Griffiths with her native county, so much indebted to her for 

 numerous discoveries in almost every branch of Natural History. 



For this purjDOse none certainly could have been more appropriate, 

 not only from tlie licanty and delicacy of its structure, but as being 



