114 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



rate information concerning distribution and variation has been avail- 

 able to me. Every lot of shells collected from the South Kaukonahua 

 shows a different set of color patterns. Wilder's lot contained a mix- 

 ture of A. a. f libera lis var. 4 patterns, which were mixed with decid- 

 edly smaller shells with a different range of color patterns. Therefore, 

 the var. 4 patterns are selected out and the remaining shells are con- 

 sidered tuberans var. 5, which may be the same or a lower race (fig. 5, 

 p. 105). Also collected by Thurston, BBM 130737. 



The usual form of the shell (pi. 9, fig. 17) has the embryonic 

 whorls bicolored ; first embryonic whorl natal brown, next whorl 

 upper half white, lower half natal brown, last embryonic whorl and 

 a fourth white; first half postembryonic whorl white, penultimate 

 whorl axially streaked by straight and zigzag streaks of warm sepia 

 and vinaceous buff, and spirally lined and banded with white, last 

 whorl above the periphery ornamented with a band of white and a 

 line of buffy brown and a band of vinaceous buff axially streaked 

 with olive brown and hair brown, below the periphery the ground 

 is white, banded with a band of bister and a band of drab axially 

 streaked with olive brown ; impressed sutural band mikado brown. 

 Length 16.9 mm., greater diameter 11.6 mm., spire height 7.8 mm., 

 number of whorls 6. 



A narrow shell (pi. 9, fig. I7«) with lighter embryonic whorls, 

 has a more usual color pattern which occurs on 34 percent of the 

 shells, embryonic whorls bicolore.d, first embryonic whorl vinaceous 

 buff, next whorl upper half white, lower half vinaceous buff, last 

 embryonic whorl and a quarter white ; first postembryonic whorl white 

 spirally lined with army brown, last two whorls pale gull gray, penulti- 

 mate whorl spirally lined and faintly axially streaked with fuscous, 

 last whorl above the periphery banded with olive brown, the bands 

 axially broken by streaks of pale gull gray, at the edge of the periphery 

 a line of bister, below the periphery a band of pale gull gray, below 

 this a line of bister and a band of drab axially streaked with natal 

 brown, the remainder of the base banded with bister and drab; im- 

 l)ressed sutural band chestnut lightening on the last half whorl to 

 tawny. Length 16.6 mm., greater diameter 10.8 mm., spire height 

 9.2 mm. 



The obese form (pi. 9, fig. lyb) and color pattern occurring on 

 28 percent of the shells has the last two postembryonic whorls white 

 or pale gull gray spirally lined with natal brown and axially 

 streaked with pale gull gray, just above the edge of the periphery to 

 the edge of the periphery a band of light seal brown, base banded and 



