144 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



streaked with mikado brown, remaining whorls chocolate, faintly 

 axially streaked with pinkish buff, spirally lined on the upper third 

 of the whorl above the periphery with a line of light drab and cin- 

 namon, on the last half whorl above the periphery the chocolate 

 ground color changing to buffy brown or olive brown axially streaked 

 and banded with a band of bone brown, below the periphery a band 

 of cartridge buff and a band of chocolate, the remainder of the base 

 cartridge buff spirally lined with drab gray and two bands of natal 

 brown in the umbilical region. 



In the lot collected by Steel from locality 271 a gray color pattern 

 is found (pi. 10, fig. 4) ; postembryonic whorls light drab axially 

 streaked with hair brown, fuscous, benzo brown, and faintly spirally 

 lined with fine lines of fuscous and white, below the periphery of the 

 last whorl the ground white, shaded with pale gull gray and spirally 

 banded with a band and a line of light drab axially streaked with 

 fuscous, in the umbilical region a line and a band of fawn color. 



In the Wilder collection, mixed with color patterns of typical 

 A. a. steeli, are a series of color patterns which have the base 

 white or banded with white below the periphery and contain dextral 

 as well as sinistral shells. The shells may be typical A. a. steeli or 

 they may come from a different area. 



The usual form of a dextral shell and a characteristic color pattern 

 in this lot (pi. 10, fig. 5) has the embryonic whorls cartridge buff; 

 postembryonic whorls pecan brown, spirally ornamented on the last 

 whorl and a half -with a white band or line, below the impressed 

 pecan brown sutural band and in the center of the whorl above the 

 periphery, edge of the periphery banded with a wide white band, at 

 the upper edge of which is a line of pecan brown, remainder of the 

 base white with a central band and a line of pecan brown, in the 

 umbilical region a patch of fawn color ; lip and columella callus pale 

 vinaceous fawn, outer margin spotted with fawn. Length 20.0 mm., 

 greater diameter 13.0 mm., spire height 10.6 mm. 



The base may be entirely white (pi. 10, fig. 5a) faintly shaded with 

 vinaceous fawn and lined with a line of army brown in the umbilical 

 region ; the postembryonic whorls above the periphery are similar 

 to plate ID, figure 5, only more axially streaked and spirally lined 

 with white. A narrow sinistral specimen (pi. 10, fig. 5&) measures: 

 Length 18.4 mm., greater diameter 12.2 mm., spire height 9.7 mm. 

 An obese shell (pi. 10, fig. 5r) measures: Length 18.0 mm., greater 

 diameter 13.6 mm., spire height 9.0 mm. The shells of figures 5& and 

 5c have a similar color pattern to the shell of plate 10, figure 3. 



