4 M. FOSLIE. [1899 



shaped layers of tissue, the cells of which frequently are rectangu- 

 lar, 9—14 jx long and 7 — 8 jj- broad, sometimes however smaller 

 with rounded corners. 



The said specimen has been dredged off St. Helena, but the 

 depth is unknown. 



Another but steril specimen in British Museum"s herbarium 

 according to the label from „Ilha do IVincipe — We hvit sch iter 

 angolense" seems to belong to the same species. However, the 

 structure has not been examined. 



In Thurets (Bornet's) herbarium is a steril specimen from 

 Gran Canaria collected and determined as L. racemus by Vi c le- 

 er s^). A\so th\s resemhles Litho2Jh. racemus in habit, but differing 

 so much in structure that it cannot be referred to this. It is 

 smaller and the branches not so coarse as the above quoted spe- 

 cimen of L. hracliydadimi, but it probably is to be referred to 

 this species, as it stands very near to it in structure, only the 

 cells most often a little smaller than the above quoted measures, 

 and the corners of the cell-rooms frequently more rounded.^) 



Thus it seems as if the species in question is rather widely 

 dispersed comprehending forms similar to those in LitJioph. race- 

 mus. It probably occurs nearly all along the west coast of Africa, 

 while L. racemus is not with certainty known from this part of 

 the African coast, but is on the other hand dispersed from the 

 Mediterranean through the Red Sea and towards the south-eastern 

 coast of Africa, apparently also following the coast of Asia even 

 to Japan according to specimens however not jæt quite determined. 



Lithothamnion brasiliense Fosl. mscr. 



f. genuina. 



f. heteromorplia Fosl. mscr. 



Thallus at first forming thin crusts on shells, from which issue 

 subdichotomous branchsystems, at length forming angular balls 



1) A. Vickers, Contribution å la flore algologique des Canaries. Annales des 

 Sciences naturelles. Ser. VIII. Bot. T. 4. Pag. 293. 



2) There is also another and steril specimen referred to the same species, but 

 different from the present. 



