490 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



prominent components of this vegetation are Grateloupia dicho- 

 toma and Gr. cuneijolia^ Enteromorpha lingiilata^ Uha Lactuca, 

 Gymnogongrus tenuis, Bryopsis pJiimosa, Hypnea cervicornis and 

 mus cif or mis, Spyridia filamentosa and Sp. clarata etc. 



In deeper water at a depth of about 5 fathoms near Buck 

 Island at St. Croix a rich vegetation of various algæ was present; 

 among the most characteristic were Griffithsia globijera, Liagora 

 pinnata, Wrangelia penicillata, Laurencia Poitei and L. obtusa, 

 Hypnea cervicornis, Gracilaria lacinulata, Digenea simplex, Am- 

 phiroa fragilissima, Dilophus Gui?ieensis, Dictyota ciliata and 

 D. volubilis, Zonaria variegata, Udotea Flabellum, Penicillus La- 

 mourouxii, Caulerpa cupressoides, Neomeris annulata and several 

 others 



In a similar depth off Frederikssted, St. Croix, was found: 

 Penicillus capitatus and P. pyriformis, Udotea Flabellum and U. 

 conglutinata, Dictyota indica, D. volubilis and D. linearis, Am- 

 phiroa fragilissima, Jania cubensis, several Galaxaura-species 

 Cladophora crispula, Champia parvula, Spyridia filamentosa and 

 Sp. clavata, Digenea simplex and many others. 



In the sea at St. Thomas west of Water Island in a depth 

 of about 10 — 15 fathoms a vegetation composed mostly of Chlo- 

 rophyceæ and among these especially representatives of Codiaceæ 

 were found. Of this family were present here: Penicillus capi- 

 tatus, P. pyriformis and P. Lamourouxii, Udotea cyathiformis, 

 U. verticillosa and U. Flabellum, Avrainvillea nigricans, A. Mazei, 

 A. asarifolia, Halimeda Tuna forma platydisca, H. incrassata 

 and Cladocephalus luteofuscus. Of other algæ: Caulerpa prolifera, 

 C. crassifolia, C. cupressoides var. flabellata etc. Dictyosphæria favu- 

 losa, Valonia ventricosa, Microdictyon umbilicatum, Anadyomene 

 stelota, Callithamnion spec, Cottoniella, Dictyurus occidentalis, 

 Gracilaria lacinulata, Zonaria variegata and several others. 



But the richest flora of all was found in the sound between 

 St. Thomas and St. Jan in a depth from about 10 to 20 fathoms. 



Here was found: Dasya elegans, D. ramosissima and D. cara- 

 ibica, Lophocladia trichoclados, WrightieUa Tumanowiczii, Wran- 

 gelia bicuspidata and W. penicillata, Delesseria tenuifolia, Aspara- 

 gopsis taxiformis, Gracilaria cylindrica with Callithamnion corda- 

 tum, Rhodyme?iia occidentalis, Rhabdonia ramosissima, Griffithsia 

 globifera, Callymenia perforata, Bryothamnion Seaforthii, Galax- 



