Smithsonian miscellaneous collections . fig. 7, U. S. National Museum, CatalogueNo. 62549. Figs. 7, 8 and 9 are from the Middle Cambrian: (302s) Parkshale, on northwest side of Grizzly Gulch, about miles southwestof the city of Helena. 10. (X 10.) Enlargement by photography of the surface of aspecimen preserved in a shale where the exterior surfacedoes not adhere to the matrix. Where the surface clings tothe matrix, the specimens have the appearance of thoseillustrated by figs. 7 and 9. Fig. 10 is of a specimen from locality 4g, Middle Cambrian:about 325 feet ( m.) above the base of th
Smithsonian miscellaneous collections . fig. 7, U. S. National Museum, CatalogueNo. 62549. Figs. 7, 8 and 9 are from the Middle Cambrian: (302s) Parkshale, on northwest side of Grizzly Gulch, about miles southwestof the city of Helena. 10. (X 10.) Enlargement by photography of the surface of aspecimen preserved in a shale where the exterior surfacedoes not adhere to the matrix. Where the surface clings tothe matrix, the specimens have the appearance of thoseillustrated by figs. 7 and 9. Fig. 10 is of a specimen from locality 4g, Middle Cambrian:about 325 feet ( m.) above the base of the Cambrian, in theFlathead shales of Peale, i mile ( km.) north of the junction ofEast and West Gallatin Rivers, Gallatin County, Montana. U. S. National Museum, Catalogue No. 51685c. Specimen figuredby Walcott, fig. i 0, Plate 47, Monogr. 51, U. S. Geol. Surv., 1912. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 64, NUMBER 5 CAMBRIANGEOLOGY AND PALEONTOLOGY III No. 5. CAMBRIAN TRILOBITES . (With Plates 45 to 67) BYCHARLES D. WALGOTT. (Publication 2420) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION SEPTEMBER 29, 1916 C^e JSorb (^adimote (preee BALTIMORE, MD., U. S. A. CAMBRIAN GEOLOGY AND PALEONTOLOGYIII No. 5.—CAMBRIAN TRILOBITES By CHARLES D. WALCOTT (With Plates 45 to 67) CONTENTS PAGE Introduction 307 Descriptions of genera and species 308 Family Corynexochidae Angelin 308 Corynexochus Angelin 309 Coryncxochus bornholmicnsis Gronwall (pi. 55, figs. 2, 2a-b) 313 Corynexochus brennus, new species (pi. 57, figs. 3, 30-6) 314Corynexochus bubaris, new species (pi. 56, figs. 2, 2a-b, 3, 3a-f) 314 Corynexochus capito, new species (pi. 57, figs. 2, 2a-e) 315Corynexochus clavatus (Walcott) (pi. 55, figs. 4, j,a-b) 316 Corynexochus dclagei Miquel (pi. 55, figs. 2, ^a) 317 Corynexochus minor (Walcott) (pi. 55, figs. 6, 6a-d). 319Corynexochus senectus (Billings) (pi. 55, figs. 7, 7a-c; pi. 56, figs. I, la-g) 319 Corynexochus spinulosus Angelin (pi. 55, figs, i, la-b)
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