Ill 



each other. In my paper quoted I have given some examples 

 illustrating this fact. 



Referring to these observations, therefore, I cannot con- 

 sider the forms found by me at the Danish West Indies as 

 different species but only as varieties of the same species. 



var. typica Barton. 

 Barton, 1. c, p. 27. 



Most of the specimens referred to this variety were in good 

 accordance with the figure of Mrs. Gepp, some of the specimens 

 had some resemblance with forma tripartita Gepp, 1. c, p. 27, 

 fig. 43, though not quite so typically developed as this figure ; 

 some others had a little 

 broader joints approaching 

 them somewhat to var. 

 simulans. As to the size 

 of the peripheral utricles, 

 the diameter of these in 

 most of the specimens was 

 found to be about 40 — 50/.<, 

 in others cells were found 

 with diameter up to 100/>!. 



In Christiansted's La- 

 goon I have found a nice 

 little form which I think 

 deserves to be considered 

 as a new form. 



L gracilis Borgs. Fig. 89. 



Joints small, nearly cir- 

 cular or broad oval and 

 indistinctly ribbed. Not 

 much calcified and rather 

 flexible. The diameter of 

 the peripheral utricles varies 

 from 40—67/^. The fda- 

 ments of the central strand 

 communicate at the apex of 

 the joints by means of pits. 

 Of the forms described by 



Mrs. Gepp I think it comes Fig. 89. Halimeda incrassata (Ellis et 



. , J. , , Solander) Lamx. var. typica, forma 



nearest to forma rotunda gracilis Borgs. (About 1 : 1). 



