kryptogamiske Planter fra St. Croix« (Skrivter af Naturhistorie- 

 Selskabet, 5te Bd., 2det Hefte, Kiebenhavn 1802). 



Later, Professor 0rsted has made rich gatherings at the 

 islands and some of his specimens have been determined by 

 J. Agardh. 



And furthermore Baron Eggers, C. 0. E. Hansen Ganne- 

 SKOV, JoHS. H. Krebs, Holger Lassen, Dr. Th. Mortensen, 

 Professor Warming and several others have collected algse at 

 the shores of the islands. 



In West's book, »Bidrag til Beskrivelse over St. Croix« 

 etc., Kiobenhavn 1793, a few algae are named, and in John Knox' 

 »A historical account of St. Thomas, W. L« etc. New York 1852, 

 some few algae are also mentioned in the plant list p. 230. This 

 list is reprinted in B. v. Petersen, »En historisk Beretning om 

 de dansk-vestindiske 0er, St. Croix, St. Thomas og St. Jan«, 

 Kjobenhavn 1855. Finally in Millspaugh, »Flora of the island 

 of St. Croix« some few algse, determined by Prof. Farlow, are 

 mentioned. 



Before concluding these introductory remarks I wish to 

 express my thanks to the many botanists who in different ways 

 have helped me in the working out of this paper. 



I am especially obliged to Mrs. and Mr. Gepp in London who 

 have not only been of great help to me during my visits to the 

 British Museum (Natural History) but have also, when pre- 

 paring their monograph of the Godiacese, had my material of 

 Penicillus, Udotea and Rhipilia for determination. 



Also my thanks are due to Mr. Frank S. Collins in Maiden, 

 Prof. V. G. Farlow in Cambridge and Dr. Howe in New York for 

 sending me collections of marine algae from the West Indies and 

 surrounding islands, which have been of much value to me. 



Furthermore I am much obliged to the late Dr. Bornet, 

 M. Paul Hariot, Prof. Mangin, Prof. 0. Nordstedt, Prof. 

 Okamura, Major Reinbold, Dr. L. Kolderup Rosenvinge, 

 "M"^ Weber-van Bosse and Professor Wille either for lending 

 me specimens for comparison or determining species for me. 



Finally, I would express my indebtedness to the Direction 

 of the Carlsberg Fund for the grant in aid of the many 

 drawings and reproductions. As to some of the last mentioned I 

 would also thank Det Kgl. Danske Videnskabernes Selskab 

 and Natur historisk Forening for permission to reprint hero 

 some drawings used in some of my earlier papers. 



