



Lithothamnion phil. emend. 



L. erubescens Fosl. 

 New or crit. Lith. p. 9. 



f. prostrata Fosl. mscr. 



Less branched than the typical fonn, branches more or less 

 compressed and decumbent. 



The typical form of this species vvas hitherto but known from 

 Chaloup Bay, Femando do Noronha (Brazil). In a collection of 

 calcareous Algæ chiefly from America that Pro f. W. G. Farlow had 

 the kindness to send me is a couple of specimens from Bermuda 

 which accord with the said form except that the branches are 

 slightly thinner and the cells often a little smaller, bearing numer- 

 ous sporangia in January. There cannot be any doubt as regards 

 the identity with the a bo ve species. 



In the same collection is a couple of other specimens also from 

 Bermuda which must be considered as a denominated form of the 

 above species, f. prostrata. It differs from f. typica being less 

 branched, the branches frequently compressed and more or less 

 decumbent, not so crowded but of about the same thickness as 

 in the said form. It agrees in the main with the latter also with 

 reference to the conceptacles as well as in structure. This form 

 somewhat approaches L. DicJdei. 



The typical form known from the coast of Brazil, and from 

 Bermuda, herb. Farlow, no. XII, and f. prostrata only from Ber- 

 muda, herb. Farlow, no. XVIII. 





