Stanford University Publications: Geological sciences, Volume 2 |
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1919 Proceedings Acmaea Alaska anfr angulated anteriorly aperture aperture ovate apex appressed Arctic Ocean arcuate axial ribs axial sculpture Bartsch Bering Sea Bulletin 68 callus canal short Carpenter color columella convex curved diameter external sculpture fasciole fathoms Genus grooves Gulf of California Height of shell incremental lines inner lip Intercostal spaces last whorl last whorl well-rounded Length lines of growth Lower California Manual of Conchology margin Monterey narrow National Museum nucleus oblique obsolete Odostomia operculum outer lip thin oval parietal wall covered penultimate turn periostracum periphery pillar Plate Post-nuclear whorls posterior angle acute posterior angle obtuse Pribilof Islands Range riblets San Diego San Pedro Shell small shoulder slender slightly smooth spiral cords spiral keels spiral sculpture spiral striations spire striae strong succeeding turns summit surface suture suture distinct testa thin callus Tryon and Pilsbry Turbonilla Type in United Type locality umbilical umbilicus United States National varices