Spatial distribution and some ecological aspect of hermit-crabs pagurus spp. In the intertidal shore of Pulau Dua Natural reserve, Banten bay.Pulau Dua natural reserve,as a bird sanctuary, is now threatened by water pullution and environmental degradation. To monitor is condition,an observation of the biotic intertidal comunity has been taken. One of the biotic intertidal comunities is hermit-crab (Pagurus spp). There are two species of crabs, namely Pagurus granosimanus and Pagurus hursutiusculus. Their weight are 202.80 mg and 724.90 mg. and their body lenghts are 13.00 mm and 20.71 mm respectively.The spatial distribution of the species is contagious and cluster (V=16.84)>Environmental factors such as air and water temperature,pH and water salinity,were measured