At page 37 of his chapter “On the Minute Structure of the Shells of the Brachiopoda,” and forming part of my work “On British Fossil Brachiopoda,” Dr. Carpenter says:— “Chonetes.— Of this genus, also, I have examined two species, armata and lata, both of which are perforated,”—but Dr. Carpenter does not explain in what way they are perforated, viz. whether these perforations pass through the entire thickness of the valve, or are restricted to a small portion of its thickness as in Productus.