Descriptions of New Species of Fossils From the Cretaceous Formations of Nebra
Descriptions of New Species of Fossils From the Cretaceous Formations of Nebra
James Hall
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Louis. The aperture in this one is nearly entire, and, where partially exfoliated, shows in some places a thickening of the shell, with impressions of crenulations, as if the growth had been interrupted at intervals. It is with much doubt that this shell is referred to the genus Fusus. Locality and Position. Sage Creek. Upper part of division No. 4 of Section. FROM THE CRETACEOUS FORMATION OF NEBRASKA. 393 ROSTELLARIA FUSIFORMIS, n. Sp. PLATE III. FIG. 10, a, Z>. Shell elongate, fusiform ; spir...e elongated ; volutions (number unknown) moderately convex, marked by numerous regular rounded oblique flexuous folds, which terminate abruptly above in small indistinct nodes, giving a sub-coronate aspect to the upper part of the volutions ; surface unknown ; suture distinct and separated from the row of nodes below it by a shallow depression ; aperture elongate, widest near the middle, and narrowing anteriorly into a prolonged canal. Spiral angle 35 ; breadth, 1. 1 inch. Our specimen is imperfect at both extremities, and so exfoliated as to preserve none of the surface markings.
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