276 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Columbella aurantiaca Dali, 1871 
Plate 28, fig. 5 
American Journal of Conchology, 7:115; PI. 15, fig. 13. 
Shell minute, fusiform, smooth, with five gently rounded, noncarinated 
whorls. Color generally orange yellow, semitranslucent, and without 
markings, but occasionally darker, passing into dark brown, or with close 
zigzag brown lines on the yellow ground. Columella slightly arcuated, 
outer lip slightly sinuated, hardly striate inside. No callus on the colu¬ 
mella. Nucleus subglobular, rounded above, swollen as large or larger 
than the first whorl in most specimens. Long., .18; lat., .08 in. (Dali.) 
Type in United States National Museum. Type locality, Monterey, 
California. 
Range. Monterey, California, to Magdalena Bay, Lower California. 
Described as Astyris aurantiaca. 
Columbella hypodra Dali, 1916 
Plate 16, fig. 6 
Conchological Memoranda, 12:5; PI. 1, fig. 5. 
A new name for Astyris variegata Stearns, not Columbella variegata 
Menke, 1828. 
Shell small, elongated, acutely conic, light rufous-brown or sienna- 
yellow under a thin brownish or greenish epidermis; with whitish median 
and sutural bands more or less interrupted; in some specimens these bands 
are connected by waved lines of a darker brown; surface of shell when 
free from epidermis, smooth and shining, marked with delicate incre¬ 
mental lines, and on the lower portion of the body whorl with narrow 
grooves; apex rounded, whorls seven, convex; suture well-defined, aper¬ 
ture ovate, about one-third the length of the shell; outer lip simple, in 
some specimens a little thickened with small tubercles on the inner side. 
Long., .3; lat., .12 in. (R. E. C. Stearns.) 
Type in United States National Museum. Type locality, San Diego, 
California. 
Range. Puget Sound to Puerto Libertad, West Mexico. 
Genus NITIDELLA Swainson, 1840 
Shell oval, smooth, with elevated spire; aperture somewhat effuse 
below; columella with two small anterior plications; outer lip somewhat 
thickened. (Tryon, Manual of Conchology.) 
Type. Columbella nitida Lamarck. 
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