135 



and was growing on coral-sand in a smaller basin with fresh sea- 

 water and with some swell. 



A rhythmical growth quite like that described by Svedelius 

 1. c. p. 114 and which I have already mentioned for other species 

 is also often to be found in this species in the West Indies. It is 

 present e. g. in the specimens I have distributed in Wittrock 

 and NoRDSTEDT, Algse exsiccatse Nr. 1585. 



Caulerpa sertularioides is a very common species along the shores of 

 the Danish West Indies. Forma typica and brecipes are commonest in more 

 exposed locaUties, e. g. St. Croix: Lime Tree Bay, White Bay, behind Long 

 Reef etc., St. Thomas: The harbour. St. Jan: The bay at Christiansfort 

 etc. Forma longiseta is most common in lagoons, e. g. St. Croix: the I^agoon 

 of Christianssted, behind Long Reef in sheltered localities with sea-grass, 

 in the Bovoni Lagoon at St. Thomas etc. Forma Farlowii was only found 

 once at St. Jan in Durloes Bay (leg. Dr. Th. Mortensen). 



Geogr. Distrib. The West Indies, Florida, Red Sea, Ceylon, Friendly 

 Islands etc. 



9. Caulerpa Ashmeadi Harv. 



Harvey, Nereis Boreali-Americana, p. 18, pi. 28, fig. A. J. Agardh, 

 Till Algernes Systematik, I, p. 16. F. Borgesen, 1. c, p. 367. 



This splendid species (Fig. 107) I have found several times in 

 the sea around St. Thomas and St. Jan. It is distinguished by its 

 distichous, sometimes spread, sometimes oppositely placed ramuli. 

 These are cylindric-conical as the figure shows, being evenly thicker 

 upward with the apex stubby, rounded. The species seems to 

 vary very little, only regarding the size there is some variation. 

 The largest specimens I have found do not quite reach the size of 

 Harvey's plant, the smallest were only 3 cm. high and the whole 

 plant both the rhizome and the leaves were proportionally small. 

 The plant is found in a depth of about 20 — 30 meters where 

 it creeps on the sandy bottom. 



It has hitherto been found! at St. Thomas in the sea west of Water 

 Island; St. Jan in the sound between St. Thomas and St. Jan off Chri- 

 stiansfort; in the sea to the north of St. Jan west of Tortola and off Maho 

 Bay and Linster Bay. Murray (23, p. 32) mentions this species from St. 

 Thomas where it was found by the »Challenger« Expedition. 



Geogr. Distrib. This species is a distinctly Atlantic-American spec- 

 ies and is found at the shores of the West Indies and Florida only. 



10. Caulerpa cupressoldes (Vahl) Ag., Weber-van Bosse emend. 



Weber-van Bosse, Monographic, p. 323. Borgesen, 1. c. p. 368. 



Fucus cupressoides Vahl, En deel kryptogamiske Planter fra St. Croix. 

 Skrivter af Naturhistorie-Selskabet, 5te Bind, 2det Hefte, Kiobenhavn 

 1802, p. 29. 



