Stromboidea
Original Description of Anchura johnsoni by Stephenson, 1923, p. 371:
- "Shell of moderate size with high spire and eight whorls. The apical angle is 40 degrees, the side of the spire maintaining approximately the same angle of divergence, or converging a little, giving a slightly inflated longitudinal profile. Sides of whorls nearly flat to slightly convex, and a little compressed below the suture; suture moderately impressed. The larger whorls of the spire ornamented with 14 to 16 strong, somewhat irregularly spaced, round crested, axial ribs which in trend are slightly concave toward the front; finer ribs can be seen on the smaller whorls with the exception of the two smooth nucular whorls. On the upper part of the body whorl are about 14 prominent longitudinal ribs which end rather abruptly a little more than halfway to the base; these are crossed by very fine spiral lines; the lower part of the whorl is marked by fine, rather distinct spiral ridges. The inner lip of the adult is thickened and spreads a little forward on the body whorl. The outer lip expands into a prominent spur-like projection, at first broad and nearly horizontal, then curving sharply upward and narrowing quickly to a point. On the lower edge of the lip are two minor projections, the inferior one of which is the largest. A distinct ridge traverses the outer surface of the main projection a little above the center, curving upward and extending to the farthest tip of the lip; this ridge fades out quickly where it passes backward onto the body whorl. Canal short, straight, and narrow. Aperture somewhat elongated, angulated above and below. Approximate dimensions of the type (Pl. 92, fig. 1): Altitude 32 mm., greatest diameter 11 mm.; the altitude of one specimen in the collection is at least 40 mm."
Anchura johnsoni Stephenson, 1923, pl. XCII, fig. 1, 2, 3, 4
Specimens from institutional collections
Graciliala johnsoni (Stephenson, 1923); Tupelo Tongue, Coffee Sand, Campanian, Cretaceous; Guntown, Lee County, Mississippi, USA; Coll. Stichting Schepsel Schelp, No. 27021
Graciliala johnsoni (Stephenson, 1923); Tupelo Tongue, Coffee Sand, Campanian, Cretaceous; Guntown, Lee County, Mississippi, USA; Coll. Stichting Schepsel Schelp, No. 27021
Graciliala johnsoni (Stephenson, 1923); Chapelville Horizon, Coffee Sand Formation, Tupelo Tongue member, Maastrichtian Cretaceous; Baldwyn, Mississippi, USA; Coll. Florida Museum of Natural History UF 190705
Graciliala johnsoni (Stephenson, 1923); Chapelville Horizon, Coffee Sand Formation, Tupelo Tongue member, Maastrichtian Cretaceous; Baldwyn, Mississippi, USA; Coll. Florida Museum of Natural History UF 190707
References
