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- C5 Sequence (Lower Whitewater, Waynesville)
Identification in Hand Sample
- Large shell, consisting of three to four volutions
- Loosely coiled to create a wide, open umbilicus
- Posterolateral lip of adult aperture slightly reflexed
- No surficial markings
- Last volution obtusely carinated
Bucania simulatrix from the Whitewater Formation of Richmond, Indiana (OUIP 1667)
- Diagnosis. – Shell large (up to 45.6 mm long), loosely coiled, with large, open umbilicus; submature whorls subreniform, adult aperture greatly expanded anteriorly with elongate subtriangular outline.
- Description. – Shell large, consisting of about three volutions, loosely coiled so as to create a wide, open umbilicus. Submature whorls rather narrow and depressed, subreniform in outline; dorsum gently convex, convexity gradually increases at greater rate, resulting in an elongate subtriangular outline. Posterolateral lip of adult aperture slightly reflexed; anterior lip curved upward into fairly deep V-shaped sinus; parietal lip apparently thickened centrally. Dorsomedian ridge over expanded portion of whorl on internal molds reflects an elevated, hollow slitband. No surface markings known.
Ulrich & Scofield (1897):
- Shell large, known from casts of the interior only. These consist of three or four comparatively slender and loosely coiled volutions, leaving a large umbilicus in which all the inner whorl are clearly exposed. Volutions somewhat reniform in section, narrowly rounded in the ventral third of the sides, the ventral surface gently concave, the dorsal part of the section nearly semi-circular. Last volution obtusely carinated, with the dorso-ventral diameter increasing toward the aperture more rapidly than is the case with the inner volutions, the height and width of the whorl just behind the aperture being about equal, while at the smaller end the two dimensions are respectively about as three to five. Aperture somewhat triangular-ovate, wide below, the expansion taking place chiefly at the lower part of the sides. In the cast the expansion appears very abrupt, but doubtless it is much less so in the shell itself. Inner lips slightly reflexed at the sides, thick centrally; outer lip broadly and deeply sinuate. Surface markings unknown; slit long. The best specimen seen has the following dimensions: entire height 46 mm.; height of aperture 29 mm.; greatest width of same 33 mm.; width and height of last volution just behind the aperture about 23 mm.; height and width of inner end of same 5 and 8.5 mm. respectively; greatest diameter of umbilicus about 23 mm.; length of slit about 31 mm.