208 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
pressis, sulculis spiralibus latioribus baud impressis, distantibus, in spira 
iii., circa basim rotundatum circ. vi. subobsolatis; apertura ovata; plica 
acuta, declivi, parva, parieti contigua; labro acuto; labio indistincto; 
columella antice parum effusa. Long., 0.1; long, spir., 0.04; lat., 0.06 poll. 
(Carpenter.) 
Shell elongate-ovate, yellowish, with the early whorls spirally lirate 
and the later ones only obsoletely so. Nuclear whorls small, smooth, 
obliquely, almost completely, immersed in the first of the succeeding turns. 
Post-nuclear whorls evenly well-rounded with appressed summits. The 
first three marked between the sutures by many subequal lirae of which 
there are about fifteen on the second turn. On the last two turns these 
lirations become quite obsolete. Periphery and base of the last whorl 
inflated and well-rounded, marked by very feeble spiral striations and 
lines of growth. Aperture moderately large, oval; somewhat effuse an¬ 
teriorly ; posterior angle acute; outer lip thin; columella strongly curved, 
re-enforced partly by the attenuated base, moderately reflected anteriorly, 
bearing a strong fold at its insertion, which appears as if it were the 
inflected termination of the columella. (Bartsch.) 
Type in United States National Museum, No. 15520. Type locality, 
Neali Bay, Washington. 
Range. Barkley Sound, Vancouver Island, to Lower California. 
Odostomia thea Bartsch, 1912 
Proceedings of the United States National Museum , 42:278; PI. 37, fig. 7; PI. 38, 
fig. 13. 
Shell moderately large, elongate-ovate, yellowish-white. Nuclear whorls 
small, deeply obliquely immersed in the first of the succeeding turns, above 
which only the tilted edge of the last volution projects. Post-nuclear 
whorls moderately rounded, rather high between the sutures, slightly 
shouldered at the summit, crossed by numerous fine, decidedly retractive 
lines of growth. The spiral sculpture is strong on the early whorls, be¬ 
coming gradually finer with the growth of the shell. The first two turns 
are divided into five, almost equal areas by four equally, strongly incised, 
spiral lines, between the sutures. On the third whorl the spiral lines are 
increased to about a dozen and are considerably less strong; on the suc¬ 
ceeding turn they are probably almost tripled and still weaker; while on 
the penultimate volution the sculpture consists of somewhat wavy, closely 
spaced, spiral striations. Periphery of the last whorl obscurely angulated, 
somewhat inflated; base moderately long, curving gently to the anterior 
portion of the shell, marked like the body whorl with fine, spiral lines. 
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