491 



aura, Chrysymenia ventricosa, Chr. Enteromorpha, Chr. Agardhii, 

 Chondria dasyphylla, Champia salicornoides and Ch. [><i.rr//l(t, 

 Mesothamnion caribaeum etc. 



Of the ffhloropkycess the most striking forms were Cauler/xi 

 Ashmeadi, C. crassifolia, C. prolifera, C. clavifera, C. cupressoides 

 var. flabellata, C. Webbiana, Struvea elegans, Rhipilia tomentosa, 

 Chamgedoris annnlata, Udotea cyathiformis, U. verticillosa, U. 

 Flabellum and U. spinulosa, Valonia ventricosa, Penicillus pyrifor- 

 rnis, Avrainvillea nigricans, Avr. asarifolia, Halimeda discoideo 

 var. platyloba, A?iadyo?nene stellata, Acicularia Schenckii, Dict//<>- 

 spheeria farulosa, C odium tomentosum and C. isthmocladum and 

 several others. 



In the strait north of St. Jan between Tortola the algal vege- 

 tation had another composition. Here Chrysymenia Uvaria was 

 often found in large quantities. 



Some remarks on the geographical position 

 of the West Indian algal flora. 



We see from the investigation now concluded, concerning 

 the alga3 found round those West Indian islands which formerly 

 belonged to Denmark, that we have dealt with 90 species of 

 Chlorophycese, 45 of Plweophycex and 192 of Rhodophycea?., this 

 last mentioned being therefore by far the largest group. Compared 

 with the very high number of 788 species, \vhich MURRAY has 

 included in his "Catalogue of the marine algae of the West Indian 

 region" 1 ), 327, the total number found by me, is certainly not 

 a large number. But we must remember that the Myxophycese 

 are included in MURRAY'S list and moreover, as he himself admits, 

 a large number of the West Indian species in his catalogue are 

 doubtful ones, so this large number will certainly get much reduced 

 on critical examination. 



If we now will try to make a comparison between the West 

 Indian algal flora, as known from the islands in question, and 

 other algal floras, a comparison with other West Indian floras is. 

 of course, the most obvious one. But this I have not done here, 

 as, with the exception of the Bermuda Isles and in lesser 



x ) In Journal of Botany, 1888-.su. 



