Preliminary Report Upon Invertebrate Fossils Collected By the Expeditions of 1871, 1872, And 1873, With Descriptions of New Species
Preliminary Report Upon Invertebrate Fossils Collected By the Expeditions of 1871, 1872, And 1873, With Descriptions of New Species
Geographical Surveys West of the 100th Meridian U
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Genus Orthoceras Breynius. Orthoceras colon [sp. nov.) — Shell annulated, very slightly taper- ing) section oval; siphuncle large, marginal, in contact with one of the Digitized by VjOOQIC 11 broadly-rounded sides, its diameter equal to one-third of the short diam- eter of the shell ; septa smooth, convexity nearly uniform, reaching farther forward at the narrower sides than at the broader ones ; annu- lations broadly rounded, passing sinuously around the shell, the sinuosity being greater upon... one of the broad sides than upon the other ; inter- spaces corresponding nearly in width and curvature with the annula- tions. The shell-substance is not preserved upon the specimen, and the surface-markings are unknown. Long diameter, eighteen millimeters ; short diameter, fifteen millime- ters ; distance from center to center of the annulations, six millimeters. Position and locality, — Strata of the age of the Quebec group. Fish Spring, House range, Utah. CEUSTACEA. Genus Leperditia Eouault.
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