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<p>Book digitized by Google and uploaded to the Internet Archive by user tpb.
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<br>Subjects: species; aperture; whorls; lip; genus; plate; spire; columella; shells; suture; outer lip; parietal tooth; body whorl; fresh water; lip tooth; light horn; american journal; west coast; parietal wall; closely allied</div>
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George Washington Tryon,  Academy of Natural Sciences of Philadelphia Conchological Section</div>
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