54 Dansk Botanisk Arkiv, Bd. 2. Nr. 2. 



Dictyota angustissima Sonder in Kützing, 1. c, tab. 21, fig. IV. 

 Zonaria linearis Ag., Species Algarum, I, p. 134. 

 Dictyota fibrosa Kütz., 1. c, tab. 15, fig. II. 

 Dictyota divaricata Kütz., 1. c, tab. 23, fig. I. 



The specimens found were much like the figures of Kützing 

 quoted above. 



All were sterile. 



They were dredged in the open sea in a depth of about 

 40 meters. 



St Croix: Off Frederiksted. 



Geogr. D ist rib. Tropical America, Mediterranean Sea, Canary Isles etc. 



3. Dictyota volubilis Kütz. 

 Kützing, F., Species Algarum, 1849, p. 554. 

 Vickers, A., Phycol. Barbad., pi. XX. 



The specimens referred to this species accord well with the 

 good figure of M lle Vickers. But how far this form of Vickers 

 rightly is considered as belonging to the species of Kützing 

 seems to me doubtful. In any case it cannot be denied that the 

 figure of Kützing in "Tabulæ Phycologicæ", vol. IX, pi. 13, fig. II, 

 is very different from the West Indian plant. This question 

 can of course only be settled by means of the original specimens. 



The most characteristic features of the plant are the marked 

 twisting of the whole frond and the broad sinus between the 

 branches, the angles being often obtuse. 



All my specimens were sterile. 



This species is found in shallow water and in somewhat 

 deeper, down to a depth of about 10 — 12 meters. When found 

 in shallow water it was in sheltered places and here it was 

 generally lying loose upon the bottom forming entangled masses. 



It has been found: St. Croix: Christiansted, Longford, off Frederik- 

 sted and near Buck Island. 



Geogr. Distrib. West Indies, Mediterranean Sea? 



4. Dictyota pardalis Kütz. 



F. Kützing, Tabulæ Phycologicæ, vol. IX, p 16, tab. 39, fig. II. 

 J. Agardh, Till Algernes Systematik, V, p. 100. J. Agardh, Analecta 

 algolog., Contin. I, p. 68. A. Vickers, Phycologia Barbadensis, pi. XXI. 



The specimens considered as belonging to this species were 

 more irregularly dichotomously ramified than Dictyota volubilis 

 and not or only very little twisted. Some of the specimens show 



