. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. MIDDLE BALA GROUP. 53 Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. Numbers and Localities. Gk C. brevicapitata-, PI. 1 F, fig. 6 (not 4, 5), some specimens labelled and catalogued as C. subdiade- mata. Gk Gk Gk C. brevicapitata, p. 165. PL 1 g, figs. 24—31, p. Gk Gk Gk PI. 1 e, fig. 20, p. 168. Isotelus, p. 169. Calymene Senaria, Conrad (Salter, Mon. Brit. Trilob. 1865, pi. 9, figs. 5—11, p. 97
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. MIDDLE BALA GROUP. 53 Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. Numbers and Localities. Gk C. brevicapitata-, PI. 1 F, fig. 6 (not 4, 5), some specimens labelled and catalogued as C. subdiade- mata. Gk Gk Gk C. brevicapitata, p. 165. PL 1 g, figs. 24—31, p. Gk Gk Gk PI. 1 e, fig. 20, p. 168. Isotelus, p. 169. Calymene Senaria, Conrad (Salter, Mon. Brit. Trilob. 1865, pi. 9, figs. 5—11, p. 97). One of the very common Bala or Caradoc fossils —appearing to inhabit every kind of sea- bottom. It is often confounded with the C. Blumenbachii, var. brevicapitata, Port- lock. Calymene Blumenbachii, Brongniart (Sil. Syst. pi. 7, figs. 6, 7. Salter, Mon. Brit. Trilob. p. 93, pi. 8, figs. 7—16). The common Dud- ley trilobite, in its typical form, with a large broad glabella, is not found in the Bala rocks, but a variety, with narrower glabella, viz.— Calymene, var. Caractaci, Salter (Mon. Brit. Tril. p. 96, pi. 9, figs. 3—5. C. brevicapitata, Portlock, Geol. Rep. on Tyrone, &c), is one of the frequent fossils in the Bala beds. Homalonotus bisulcatus, Salter (Mon. Brit. Tril. 1865, pi. 10, figs. 3—10). Homalonotus, so named from the uniform scarcely lobed condition of the dorsal surface, is very like Calymene else, and always accompanies it in the old rocks. It however ascends in force into the Devonian, while Calymene does not. Homalonotus Sedgwickii, Salter (Mon. Brit. Tril. p. 107, woodcut, fig. 25). Homalonotus rudis, Salter (Mon. Brit. Tril. pi. 10, figs. 12—14). Asaphus Powisii, Murchison (Salter, Mon. Brit. Tril. pi. 23, figs. 2—5, p. 154). As charac- teristic of the Middle Bala rocks as the A. tyrannus of the Lower Bala, easily dis- tinguished by the faint ribs of the tail. Bryn Melyn, Bala; Cefn Coedog; Llanwddyn; Alt- yr-Anker, Meifod ; Conis- t
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