Report of the United States Geological Survey of the territories . s on plate 31, makesthe shell more nearly resemble Neptunella Newberryi, as represented on thesame plate, than is natural. The foregoing wood-cut is intended to correctthis defect in the figures on the plate. Locality and position.—Moreau River, Dakota; from the Fox Hillsgroup of the Upper Missouri Cretaceous series. Tilliis (Surcula)l II b f /. i . Meek. Shell elongate-conical (or fusiform), thin; spire much produced andturreted ; volutions about seven, distinctly convex, or subangulararound themiddle, and flattened or concave
Report of the United States Geological Survey of the territories . s on plate 31, makesthe shell more nearly resemble Neptunella Newberryi, as represented on thesame plate, than is natural. The foregoing wood-cut is intended to correctthis defect in the figures on the plate. Locality and position.—Moreau River, Dakota; from the Fox Hillsgroup of the Upper Missouri Cretaceous series. Tilliis (Surcula)l II b f /. i . Meek. Shell elongate-conical (or fusiform), thin; spire much produced andturreted ; volutions about seven, distinctly convex, or subangulararound themiddle, and flattened or concave with an outward slope above the angle, andconvex below; last one not larger than the regulai enlargement of the othersfrom the apex, each provided with about thirteen prominences or little INVERTEBRATE PALAEONTOLOGY ;;st obscure vertical folds, which on the angle of the last turn assume rather morethe character of obscure nodes: entire surface marked by raised, revolving lines; aperture trigonoid-oval, being biangular abov re ami aorupl Iv com ractei Fie. below; beak, it any existed, unknown. Length (exclusive of the beak), about 2 inches; breadth, inch; slopes of spire somewhat convex, and diverging at an angle of about 36°. As in other cases, where we have merely imper-fect specimens of univalves, I can only, as it were,balance probabilities in regard to the generic relationsof this species; the only specimen seen being merelyan internal cast, with the beak and lip broken portions of the thin shell remain attached to thecast, but even these are so eroded as only to show theremains of revolving lines. In general appearance, itresembles some species of Turris (— Pleurotoma) ; but,the margin of its lip being broken and the curves of thelines of growth not being traceable, it is impossible toA cut. of tins species determine, without other specimens, whether or not it trotii the type-specimen, wMoh was found after the has the characteristic, slit or sinus
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1876
