118 



Of this variety some specimens were found which are rather 

 typically developed but a great many specimens were inter- 

 mediate between this form and var. Harveyana, var. Leprieurii 

 and var. ti/pica. 



This variety is very common both on more exposed and on 

 sheltered coasts in shallow water. It grows most often on rocks 

 and stones but is also found on the roots of the mangroves. 



var. secunda Harv. 

 Harvey, Nereis Bor.-Am., Pt. Ill, p. 32. 



Bryopsis Harveyana J. Ag., Till Algernes Systematik, ote Afdeln., VIII. 

 Siphonese, p. 22. Vickers, Phycologia Barbadensis, PI. LI. 



Of this variety rather typical forms were found but also 

 many transitional forms occurred, this variety being only a secund 

 form of the typical Br. pJumosa. 



Found in shallow water in sheltered places, e. g. in lagoons 

 where it was growing on the roots of the mangroves, and in some- 

 what exposed locality also. 



St. Croix: Christianssteds Lagoon, Long Reef; St. Jan: Cruz Bay. 



var. Leprieurii. 



Bryopsis Leprieurii Kiitzing, Species Algarum, p. 490. Vickers, Phy- 

 cologia Barbadensis, PI. L. 



Of this variety also some rather typical specimens were found 

 but others were more or less intermediate between the above- 

 mentioned varieties. 



Occurred in rather sheltered places in shallow water. 



St. Croix: Christianssteds Harbour; St. Thomas: The Harbour; 

 St. Jan : Cruz Bay. 



Geogr. Distrib. A widely spread form in temperate and warm seas. 



Fam. 3. Cattle^ 'pace re. 



Caulerpa Lamouroux. 



1. Caulerpa fastigiata Mont. 



MoNTAGiSE in Ramon de la Sagra, Hist. Cuba, pi. 2, fig. 3. Weber- 

 van BossE, Monographic des Caulerpes (Ann. du Jard. bot. de Buiten- 

 zorg, vol. 15, p. 202). Vickers, Phycologia Barbadensis, tab. XXXVI. 

 B0RGESEN, in Botanisk Tidsskrift, vol. 31, 1911. 



This species was found in a collection from the small lagoon 

 at Cruz Bay, St. Jan. It occurred here nicely developed on muddy 

 bottom in quite shallow water and was growing as /Egagropila-\ike 

 clumps formed by the entangled rhizomes together with rhizoids, 

 and erect axes. 



