128 



KiiTziNG lias also designated the West Indian form (Tab. phyc. 

 vol. 7, tab. 3 d) as »forma firtnm. 



Forma zosierifolia I have only found in shallow water from 

 the surface of the sea down to some few feet. This form is disting- 

 uished by having a narrow leaf, only about 5 — 6 mm broad. It 

 is as a rule very richly proliferous and shows often a distinct twisting. 



Fig. 100. Caiderpa proUfera (Forsk.) Lam. f obovata J. Ag. 

 From the sea to the west of Water Island (St. Thomas). (About 1:1' 



This form grows richly between sea-grasses e. g. Thalassia 

 testudimim and Cymodocea manatoriim in shallow water in the 

 neighbourhood of Krause's Lagoon on the south coast of St. Croix. 

 A very weak surf can here enter from the sea and in 1 his the leaves 

 of Caulerpa prolifera wave to and fro. 



Besides the two forms mentioned above, I have also found 

 some few specimens whose leaves were 114 cm. broad and 17 cm. 



