114 



Forma rohusta is a rather common form and occurs in rather 

 open and somewhat exposed locahties. 



It is found at St. Croix: on sandy shores behind Long Reef and on 

 the south side in Lime Tree Bay and White Bay; further at Buck Island. 



Forma cylindrica occurs in more sheltered locahties with 

 muddy bottom. 



It is found at St. Croix: near Krauses Lagoon. 



Fig. 92. Halimeda incmssata (ElHs et Solander) Lamx. 

 var. simulans (Howe) Borgs. (About 1:1). 



var. simulans (Howe) Borgs., 1. o. p. 144. Fig. 92. 



Halimeda simulans Howe, Phycological Studies III (Bullet. Torr. Bot. 

 Club, vol. 34, p. 491, 1907). 



This nice variety is a characteristic form with broad oval 

 joints; it possesses, when living, a nice, light-green colour. The 

 diameter of the peripheral utricles lies mostly between 35 — 54 /^ ; 

 but as mentioned above variations often occur. 



This form is found partly in the lagoons, growing in shallow 

 water upon the loose bottom, partly also in deep water down to 

 30 — 40 meters or more. 



