40 ALGiE COLLECTED AT SIMON'S BAY, SEAL ISLAND, ETC. 



erythrin of the Florideae ; and perhaps the further study of the 

 conditions under which this takes place may throw much light on 

 the development of the particular substances in the living plants. 

 Though so much remains to be learned, yet even now the facts 

 appear sufficient to prove that there is some most intimate con- 

 nexion between the general organization of plants and their co- 

 loured constituents ; and I very strongly commend to botanists 

 the further study of the very important and interesting group of 

 substances to which I have directed attention in my present com- 

 munication, which must be looked upon merely as a general intro- 

 duction to a wide and difficult subject. 



Contributions to the Botany of H.M.S. c Challenger.' 



XXI. Algae* collected by H. N. Moselet, Esq., M.A., at 

 Simon's Bay, C. Gr. H., Seal Island, Marion Island, Kerguelen's 



IslanA, and Heard Island in 15 to 20 fathoms. By G-eobgb 



Dickie, M.D., F.L.S. 



[Bead February 4, 1875.] 



Rhodomelace/b. 



POLYSIPHONIA INCOMFTA, HarV.l 



The specimens are imperfect, and I therefore have some doubt 

 as to the species. 



Geogr. distr. Cape G. Hope. 



SPH^ROCOCCOlDEiE. 



NlTOPHYLLUM UNDULATUM, Ktz. 



The specimens are young or dwarf. 



Geogr. distr. Cape G. Hope. 



CltYPTONEMIACEiE. 



GlGARTINA BURMANI, Aq. 



Geogr. distr. Cape G. Hope ; and, according to Suhr, found also at 

 Cape Horn. 



* In the " Contributions," No. XVII., relating to Tristan d'Acunha, the fol- 

 lowing should be added by way of supplement : 



Prasiola calophylla, Meneg. 



A green crust on moist rocks. I have compared it with Scotch and Irish 

 specimens and can see no essential difference. The plant is also found in Franca 

 and Germany. 







