In the New Red breeciated conglomerate of the coast of South Devon there are numerous fragments of Devonian limestone, on the weathered exterior of some of which botryoidal and concentric chalcedony is commonly found. There does not seem to be anything in the nature of the material to call for a new name from a mineralogical point of view; but, as the ettalcedonic shells to be described are peculiar in their mode of occurrence and form and are locally called Beekites, and the mineral is commonly spoken of as Beekite, after Dr. Beck, Dean of Bristol, who first called attention to it, I will use the word where convenient.