157 



My specimens of var. Lamouroiixii show for the rest a con- 

 siderable variation. A specimen (Nr, 2036) collected off America 

 Hill at St. Jan in about 30 meters depth was very like the figure 

 of Turner and especially the fig. c, tab. 14 in Kutzing »Tabulse 

 phycol.«. Other specimens (Nr. 1121) from St. Thomas collected in 

 the sound to the west of Water Island in about 20 meters of water 

 had some likeness with var. laetevirens, having rather long, but 

 somewhat feeble swollen ramuli, but these were distichous. Again, 

 others like that here delineated (Fig. 126) collected off Hermitage 

 at St. Jan in the sound between this island and Tortola in about 

 30 meters of water, seem to me to approach the var. corynephora; 

 this was especially the case with a small specimen found off Chri- 

 stiansfort at St. Jan in the sound between St. Thomas and St. Jan 

 in about 25 meters of water. 



Caulerpa racemosa is a very common species along the coast of the 

 Danish West Indies, especially the varieties davifera and uvifera; i. reducta 

 is found at St. Thomas: on the coral-reef which unites the Hurricane Island 

 with St. Thomas. V 3.r. occidentalis was gathered in St. Croix: Long Reef 

 at Christianssted and near Sandy Point, St. Thomas: in the harbour 

 at Charlotte Amalie and St. Jan: at Christiansfort; Ydx.laetevirens is only 

 found St. Croix: in the Lagoon of Christianssted; \a.T. Lamourouxii St. 

 Thomas; in the sea west of Water Island, St. Jan: in the sound between 

 St. Thomas and St. Jan off Christiansfort and to the north of St. Jan off 

 America Hill and Hermitage. 



Geogr. Distrib. In all tropical seas. . 



Fa/77, i. Vaucheriacem. 



Vaucheria dichotoma (L.) Ag. 



C. Agardh, Synopsis Alg. Scand. 1817, p. 47. Borgesen in Botanisk 

 Tidsskrift, vol. 31, 1911, p. 148. 



In the dimensions of the thallus the form found seems to 

 agree very well with f. marina Hauck, »Meeresalgen«, p. 412. 



Lat. thall. = 90—150 /^ 



— oospore = ca. 270 n. 



— antherid. = ca. 100 n. 

 Long. — — ca. 175 /-«. 



It was found St. Croix: Krauses Lagoon, on soft, moist bottom near 

 the shores. 



In »Algologiska smasaker« (Bot. Notiser 1879) Nordstedt 

 mentions that he had found a specimen of this species from S t. 

 Thomas in Herb. J. Agardh: »hab. in lignis fluitantibus. Ser. E 

 no. 36 (»Duchassaing«). 



