794 



nion corymbosum, C. polyspermum, Furcellaria fastigiata, Polyides 

 rotundus, Cruoriella Diibyi, Chilionema reptans, Sphacelaria cir- 

 rosa, Cladostephiis spongiosus, Asperococciis echinatus, Halidrys 

 siliqiiosa, Himanthalia lorea, Acrosiphonia flagellata, A. grandis, 

 Bryopsis phnnosa, Derbesia marina; lo Ihis group we maj' most 

 probably also refer Sterrocolax decipiens, which has certainly 

 not been found farther norlh than the Færoes, so far as I 

 know, but which may be supposed to grow in the same re- 

 gions as Ahnfeltia. 

 VI. Southern forms, not found hitherto north of the Færoes and 

 West Norway: 



Porphyra leucosticta, Callophyllis laciniata, Callocolaæ neglecta, 

 Lomentaria articulata, NitophyUum laceratum, Laurencia pinna- 

 tifida, Polysiphonia atrorubescens, Griffithsia setacea, Callitham- 

 nion grannlatum, Rhodochorton seiriolaniim, Phymatolithon læ- 

 vigatnm, Lithophyllum incrustans, L, hapalidioides, Ectocarpus 

 dasycarpus, E. grannlosns, E. hicifugus, E. velutinns, Myrionema 

 foecundum, Microsyphar Zosteræ, Sphacelaria cæspitiila, S. furci- 

 gera, Elachista scutnlata, Punctaria latifoHa, Desmotrichnm un- 

 dulatum, Litosiphon Laminariæ, Valonia ovalis, Chiorogloea 

 tuberculosa, Dermocarpa violacea, Hyella cæspitosa, Lyngbya 

 hitea , Microcoleus tenerrimus, Calothrix ærnginea and Choreo- 

 colax Polysiphoniæ. 



Lastly, we have the 6 new Færoese species, and the 3 which 

 are only determined as to the genus. Of these, Myrionema færoense 

 has been found at South -West Iceland and is thus aheady inckided 

 in the total number, and Laminaria færoensis has been taken at 

 North-East Iceland and is included in the first group; thus there 

 are only 7 species left, of which nothing^ is known as to their oc- 

 currence outside the Færoes, but of which some at least may prob- 

 ably also be found at Iceland. 



As to group I, it seems to me, that the 5 species it includes 

 must also be supposed to occur at South -West Iceland. I likewise 

 think it most likely, that the 10 species belonging to group II, may 

 be met with at Iceland. As to the 21 species of group III I think 

 there is some probability at any rate, that some of them may be 

 found at South -West Iceland, as they have been able to grow so 

 far north as the coast of Norway. 



^ Dermocarpa Farlowii excepted. 



