Palĉontology of the upper Missouri: a report upon collections made principally by the expeditions under command of Lieut. G.K. Warren, U.S. Top. Engrs., in 1855 and 1856: Invertebrates
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Acad adductor Ammonites angles angular Animal aperture appearance Avicula beaks belong Black Hills breadth Carboniferous cardinal area cardinal margin characters compressed concave concentric Conchologists convex costae Cretaceous curved D’Orbigny Dakota Territory deﬁned depressed Devonian differ distinct dorsal epoch extinct extremity ﬁgures ﬁnd ﬁne ﬁrst ﬂattened Foss fossil front Fusulina gaping genera genus gibbous Goniatites hinge line inch included Jurassic lateral left valve Length less ligament lobe Locality Manx marks of growth mesial middle modiolus muscular impressions narrowly rounded nearly Neripteron oblique Operculum outer oval pallial line Permian Phila phragmocone plates posterior side probably Prof prominent Pteria radiating ridge right valve rocks scar septa Shell small Silurian sinuous sinus slightly smooth sometimes specimens straight striaa subovate subtrigonal surface markings Surface ornamented Syst teeth Triassic truncated typical species umbonal slopes usually valve ventral valve volutions whorls