16 M. FOSLIE. [1900 



appears to be closely allied, or standing between this and G. 

 spectabile. It is separated from the former especially by its shorter 

 axes and smaller cells. It differs much in habit from the latter 

 and distinguishes itself especially by its erect and more or less 

 straight branches and frequently narrower cells with thinner walls. 

 The species is only known from Bermuda, M. Wadsworth 

 in herb. Fa r lo w, no. XXI. 



G.? spectabile Fosl. mscr. 



f. typica. 



Thallus forming subhemispheric masses irregularly subdicho- 

 tomously branched with frequently short axes, branches somewhat 

 curved, crowded, terete or subterete, 1.5 — 2.5 mm. thick, subfastigiate. 



f.? brevifulta Fosl. mscr. 



Thallus forming small nodules or irregular masses branched 

 as in f. typica, branches however less crowded, sometimes rather 

 diverging, and knott}'. 



In Riksmuseum in Stockholm is to be found a large but steril 

 specimen of a calcareous Alga from Bermuda which has been col- 

 lected some years ago by Mr. C. V. Forsstrand. At first I 

 considered it identic with Litliophyllum byssoides. It rather ap- 

 proaches certain forms of this species in appearance, but is on the 

 whole coarser than any form of the latter, and the structure is 

 different. Besides it probably belongs to the genus Goniolithon. 

 On the other hand it approaches certain forms of Lithothamnion 

 TJnyeri in habit, but otherwise being quite different from the latter. 

 Although steril I venture, however, to consider it an undescribed 

 species. 



The said specimen, the above f. typica, is subhemispheric, 

 about 32 cm. long, 24 cm. broad in the broadest part, and about 

 12 cm. thick. It seems at first to have been attached, showing 

 however a tendency little by little to loosen itself from the sub- 

 stratum. It is repeatedly but irregularly subdichotomously branched, 

 with frequently short axes. The branches are somewhat curved, 

 much anastomosing especially in the lower part of the frond, 

 crowded, upwards however more free and here and there some- 



