Abstract
1. 1. The composition of the chloragosomes of nine earthworm species was determined by electron probe X-ray microanalysis of air-dried tissue smears. 2. 2. Radiography showed that the calciferous glands (CG) of 5 species secrete CaCO 3 mineral; the CG's of the 4 other species were non-secretory. 3. 3. Ca, P, Zn and S were the major constituents of the chloragosomes of all species, except Eisenia foetida; Zn was non-detectable in E.foetida granules. 4. 4. The Ca and P concentrations and the Ca:P ratio were significantly higher in the chloragosomes of species possessing active CG's compared with species possessing inactive glands. 5. 5. The inter-specific differences in chloragosomal composition were discussed in relation to the general ecophysiology of the species studied.
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