ECOLOGY AND TAXONOMY OF Halimeda 



269 



Table XXX (cont.) 



Species 



Description of tnaterial 



Sample CaCO^ % CaCO^ 



size per dry wt 



{No. of segment per 



segments) (mg) sample 



" All data Hillis- Colin vaux (unpublished), except as below. 



'' All apical segments are older than 48 hours and hence are calcified (Section VI). 



« Stark et al. (1969). 



<*B6hm (1973a). 



* Analysed by X-ray diffraction. 



f Merten (1971). 



' Prat and Hamackova (1946). 



losses to shed segments are hard to estimate and may not be significant 

 in the initial stages of forming loose sediment. The production of shed 

 segments can be estimated if we know the carbonate content of typical 

 segments, the rate at which a single thallus sheds segments, and standing 

 crop data. In this subsection the production of carbonate by the Halimeda 



