362 



26 



Forma zosterifolia is found in several places al St. Croix, e. g. in the seagrass- 

 forniation west ol' Krause's Lagoon and in Limetree Hay to the east of this Lagoon 

 on the south coast of the island; further, on the north side on the shores of Green 

 Cay estate where the leaf nevertheless was a little broader. Forma obovata is found 

 in shallow water in several localities near Sandy Point on the south coast of 

 St. Croix, in deeper water it is found in great quantities in the sea to the west 

 of Water Island at St. Thomas in about 20—30 meters of water, and at St. Jan 

 in the sound between St. Thomas and St. Jan and in the sea to the north of 

 America Hill and west of Tortola. 



Geogr. Distr. The West Indies, Florida, Bermudas, Canary Islands, Cadiz, 

 Tangiers, The Mediterranean. 



4. Caulerpa crassifolia (Ag.) J. Ag. 



J. Agardh, Till Algernes Systematik I, p. 13. 



Howe, Phycological Studies II, p. 574. 



Caulerpa pinnata {L.) Weber van Bosse, Monographie p. 289. 



Howe has found in a specimen of Fucus 

 pinnaius in Linné's Herbarium, now in the 

 possession of the Linnean Society in London, 

 that it has distinctly cylindrical pinnules, as 

 is also later figured and described by Turner, 

 Fuci I, pi. 53, which shows a form which must 

 be supposed to belong to the C. racemosa- 

 group. This form has therefore nothing to do 

 witht he Caulerpa taxifolia ß crassifolia C. Ag. 

 (Spec. Alg. p. 436) on which variety J. Agardh 

 has based his species, and in the remarks to 

 species he also writes : "utrum synonyma ibi- 

 dem allata (F. pinnafus Linn. & Turn. Hist, 

 tab. 53) ad eandem pertineant, dicere non 

 anderem." Agardh's name must therefore 

 be used. 



Fucus crassifolius is to be found both in 

 shallow water and deeper down to a depth of 

 at least 30 meters. It prefers sheltered coasts ; 

 on somewhat exposed places it can excep- 

 tionally be found but it is rare here and 

 the specimens are only badly developed. 

 At Cane Bay on the north side of St. Croix 

 I thus found some small and few speci- 

 Fig. 7. Caulerpa crassifolia (Ag.) J. Ag. In shallow '"^"s growing behind a small coral reef 

 water from the lagoon at Christianssted. (About 1:1.) near the shore and at White Bay I have 



