. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. UPPER CAMBRIAN. Case and Column of Drawers. Beferenee to McCoy's Synopsis : and Figures of Genera. Numbers and Gk Gk Gk Phacops (Acaste). PL 1 G, figs. 17—19, p. 1G2. PL 1 g, figs. 12—14, p. 159. Gk Odontochile truncato-cavdata. PL 1 G, figs. 20, 21, p. 162. Gk Chasmops Odinit PL 1 G, figs. 22, 23, p. 164. of the species, well developed large eyes, 11 body segments, and a lobed glabella, broadest in front. It ranges through
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. UPPER CAMBRIAN. Case and Column of Drawers. Beferenee to McCoy's Synopsis : and Figures of Genera. Numbers and Gk Gk Gk Phacops (Acaste). PL 1 G, figs. 17—19, p. 1G2. PL 1 g, figs. 12—14, p. 159. Gk Odontochile truncato-cavdata. PL 1 G, figs. 20, 21, p. 162. Gk Chasmops Odinit PL 1 G, figs. 22, 23, p. 164. of the species, well developed large eyes, 11 body segments, and a lobed glabella, broadest in front. It ranges through all countries, and its vertical distribution is very great. Beginning in Lower Bala, it reaches to the upper Devonian—the latest known species being in the Barnstaple or uppermost group. Phacops, Acaste, Chasmops, Odontochile, Cryphseus, are subgenera. Phacops {Acaste) apiculatus, Salter (Siluria, 4th ed. 1867, p. 69, fig. 14, woodcut, f. 3). A small form, much like the P. Dovmingice of the Wenlock rocks. Phacops (Acaste) alifrons, Salter (Mon. Brit. Trilob. 1864, pi. 1, figs. 31—34). A peculiar convex form, very like P. sclerops of Sweden. The glabella runs out above laterally into the cheeks—hence the name. Phacops (Chasmops) macroura, Sjogren (Mon. Brit. Tril. 1864, pi. 4, figs. 18—23). A large trilobite (called Cat's Head trilobite) very common in all the Middle Bala rocks. The peculiar visage of the head is given by the swelling of the upper glabella lobes, and contraction of the lower. [Two or three of these species used to be con- founded under the name P. Odini, Eich- wald]. Phacops (Chasmops) conophthalmus, (Mon. Brit. Tril. 1864, pi. 4, figs. 24, 25). This has a wider glabella and a much shorter tail than the other species. Calymene, Brongniart. Scarce less widely spread, but not quite so long-lived as Phacops. It has a very compact form—but 13 body segments, and a lobed glabella which is smallest in front. The eye was soft, and is seldom preser
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