On Genera and Species of Spiral-Bearing Brachiopoda, from Specimens Developed by the Rev. Norman Glass: with Notes on the Results obtained by Mr. George Maw from Extensive Washings of the Wenlock and Ludlow Shales of Shropshire

Extract

As some fifteen months must unavoidably elapse previous to the publication of the Silurian Supplement to my Work on the British Fossil Brachiopoda, it has been considered desirable to anticipate a part of its contents, relating to the recent discoveries of the Rev. Norman Glass, of Manchester, as to the spirals and their connecting processes and attachments in the Brachiopoda of the Upper Silurian rocks.