137 



YQiX. typica Weber- van Bosse, Monographie, p. 327. (Figs. 

 109, 110, 111). 



var. plumarioides Borgs. 



A rather large form with somewhat flabby, spread 

 branches. The ramiih occur both in two and three rows; 

 they are bent upward, cyhndrical, 3 — 4 times, sometimes 

 even longer, the breadth of the midrib. This form has 

 most often a very clearly marked periodical growth. 

 (Fig. 112). 



var. flabellata Borgs. 



A rather richly dichotomously ramified form with 

 the branches lying nearly in the same plane, so that the 

 erect shoot becomes more or less distinctly flabellate. The 

 ramuli are rather short, 1 — 3 times as long as the midrib. 

 (Fig. 113 and 114). 



var. elegans (Grouan) Weber-van Bosse. Monographie, p. 336. 

 Clearly dichotomously ramified with the branches 

 lying in the same plane; the ramuli long, 3 — 6 or more 

 times longer than the midrib. (Fig. 115). 



Caiilerpa cupressoides is a very commonly distributed species 

 on the shores of the Danish West Indies and occurs in very dif- 

 ferent localities with highly varying external conditions of life; 

 this can be clearly seen in the form the plant has in a given locality. 



Caiilerpa cupressoides is namely to be found in a great multi- 

 tude of forms most often mutually united to each other by imper- 

 ceptibly transitional forms. 



Before trying to give a more detailed description of the forms 

 I have found in Danish West India, I may just mention that each 

 of these is directly connected with a definite locality. Regarding 

 the localities I may here refer to what I have said on this matter 

 in the introduction of my paper on the Caulerpes (1. c. p. 340). 

 I need only mention here, that Caiilerpa cupressoides is to be found 

 on more exposed coasts behind the coral reefs creeping here in 

 dazzling white coral sand, that it occurs in sheltered localities in 

 the interior of the lagoons in the often very muddy water we find 

 there, growing in the soft muddy bottom, and finally that it is 

 found in deeper water down to a depth of about 20 — 30 meters; 

 but just as there is a very even and gradual change between these 

 in themselves very different localities, in the same way the forms 

 of C. cupressoides in the different localities are evenly united by 

 transitional forms. But it is just in the above-named localities. 



