80 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



white, banded and lined with ochraceous tawny, penultimate and last 

 whorl above the periphery, upper half pale pinkish buff axially 

 streaked and spirally lined with ochraceous tawny, lower half a deep 

 shade of diamine brown or black, and banded about the base with 

 ochraceous tawny. 



In the J. S. Emerson collection there is a large series of these 

 shells, with some A. a. perplexa specimens mixed from area 40. They 

 are made up of yellow and reddish-brown patterns. The usual form 

 and color pattern on 30 percent of the dextrals (pi. 7, fig. 2), has 

 the embryonic whorls white ; postembryonic whorls warm buff, 

 spirally lined on the penultimate with verona brown, last whorl 

 banded and lined with verona brown and snuff brown, peripheral 

 band pale pinkish buff; lip and columella callus shell pink. Length 

 18.5 mm., greater diameter 12.7 mm., spire height lo.o mm. The 

 color pattern may be lighter (pi. 7, fig. 2a), postembryonic whorls 

 warm buff, lined with ochraceous tawny; upper edge of impressed 

 sutural band russet, lower half warm buff ; base lined with warm sepia. 

 This yellow form may be lined and banded on the last two whorls 

 with diamine brown over a warm buff ground (pi. 7, fig. 2&). A 

 variant of this pattern has a white peripheral band on the last whorl 

 between the two diamine brown bands. Figure 2b shows an extreme 

 obese dextral. Length 18.6 mm., greater diameter 14.0 mm., spire 

 height 9.0 mm. 



The reddish-brown pattern (pi. 7, fig. 2c) may be solid liver brown 

 on the last two and a half whorls, first half postembryonic whorl 

 ochraceous tawny and looks like a form of typical A. a. apexfulva. 

 The form and usual color pattern of a sinistral shell (pi. 7, fig. 2d), 

 has the last two whorls and a half liver brown, with a band of pale 

 pinkish buff at the periphery on the first half of the last whorl, and 

 a band or line of warm buff above the periphery on the last half of 

 the last whorl. Length 19.8 mm., greater diameter 13.6 mm., spire 

 height 10.4 mm. The shell may be narrower and more banded (pi. 7, 

 fig. 2e). Length 19.2 mm., greater diameter 12.3 mm., spire height 

 lo.i mm. The first postembryonic whorl is light buff, last two 

 whorls a dark shade of diamine brown banded on the penultimate 

 with light buff, last whorl at and below the periphery banded with 

 white. An extremely lined form (pi. 7, fig. 2/) has the first half of 

 the penultimate whorl light buff spirally lined with ochraceous tawny, 

 last whorl and a half light buff, spirally lined above the periphery 

 with bone brown, base solid bone brown; impressed sutural band 

 amber brown. A rare pattern (pi. 7, fig. 2g) is diamine brown, lined 

 with pale gull gray. 



