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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt:...of it remains to show that the glabella was smooth, rather tumid, longer than wide, with a basal-lobe on each side near the neck; neck-lobe moderately broad, and marked with one central tubercle; the eyes are not preserved; border of free-cheek terminating in a short lateral spine on each side, and striated below. Free thoracic somites nine in number; extremities of pleurae smooth and truncated; axis rather wider than lateral portion of somite; coalesced abdominal somites about nine in number; axis nearly smooth, with a slightly serrated posterior edge to each body-ring, margin smooth, rather broad; the pygidium is somewhat narrower and more elongated than in the other Carboniferous species. Five specimens of pygidia referable to this species are preserved in the Museum of Practical Geology, from the Carboniferous Limestone of Northumberland, and a sixth specimen, in the same collection, from the Upper Carboniferous Shale of Ashford, Derbyshire. This species in general form agrees most nearly with G. longispinus, Portl. (see ante, p. 36, PI. VII, figs. 5 a, b, c, and 6), but G. glaber, as its name implies, is smooth or nearly so, whereas G. longispinus is coarsely tuberculated both on the head and body segments, the tail alone being smooth. In G. glaber there is a trace of minute serration seen on a pygidium from Ashford, Derbyshire, not discernible on the other specimens, but I consider that they all belong to one and the same species. Formation.--Carboniferous Limestone. Localities.--Castle-Mumbles, Glamorganshire; Northumberland; and Ashford, Derbyshire. All the above specimens are preserved in the Museum of Practical Geology, Jermyn Street. 19. Griffithides? Carringtonensis, Eth., MS. PI. IX, figs. 6 a and b. This species, named by Mr....