U.S. Geological Survey Professional Paper, Issue 142U.S. Government Printing Office, 1947 - Geology |
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Page 8
... Shell nacreous , small , trigonal to subcircular or ellip- tical ; umbones subcentral or posterior ; two series of transverse , numerous and close - set hinge teeth , sepa- rated by a triangular chondrophore ; surface generally smooth ...
... Shell nacreous , small , trigonal to subcircular or ellip- tical ; umbones subcentral or posterior ; two series of transverse , numerous and close - set hinge teeth , sepa- rated by a triangular chondrophore ; surface generally smooth ...
Page 9
... shell . Escutcheon narrow , elongate , cordate , flattened but not depressed ... small cuneiform resilium rudely parallel to the anterior dorsal margin ... small and crowded , the medial teeth in both the anterior and posterior ...
... shell . Escutcheon narrow , elongate , cordate , flattened but not depressed ... small cuneiform resilium rudely parallel to the anterior dorsal margin ... small and crowded , the medial teeth in both the anterior and posterior ...
Page 21
... Shell rather small for the genus , thin and very fragile , transversely ovate in outline , more attenuated and slightly gaping posteriorly , feebly inflated . Umbones small , well rounded , acutely pointed at their incurved , feebly ...
... Shell rather small for the genus , thin and very fragile , transversely ovate in outline , more attenuated and slightly gaping posteriorly , feebly inflated . Umbones small , well rounded , acutely pointed at their incurved , feebly ...
Page 22
... Shell small , solid , moderately convex , sculptured only with fine concentric lines ; anterior end rounded , posterior somewhat shorter , more pointed ; beaks low , with ( in the adult ) an almost linear depressed amphidetic area ...
... Shell small , solid , moderately convex , sculptured only with fine concentric lines ; anterior end rounded , posterior somewhat shorter , more pointed ; beaks low , with ( in the adult ) an almost linear depressed amphidetic area ...
Page 34
... Shell small , solid , oblique , with prosogyrate beaks , somewhat impressed mesially near the apices of the valves ; right valve ovate - rhombic with 20 strong , rounded , nodulous , radial ribs , separated by wider interspaces ; left ...
... Shell small , solid , oblique , with prosogyrate beaks , somewhat impressed mesially near the apices of the valves ; right valve ovate - rhombic with 20 strong , rounded , nodulous , radial ribs , separated by wider interspaces ; left ...
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Common terms and phrases
acute adult altitude angulated anteriorly Apertural view arcuate axial sculpture Baileys Ferry base body whorl Calhoun County canal cardinal Chipola formation Chipola River chipolana conch Conrad constricted costals Dall denticles Dimensions dorsal margin elevated fauna feebly FIGURE flattened front Gardner genus grooves height hinge holotype incremental Inner margin labrum later whorls latitude left valve less Liberty County ligament lirae lirate lunule Maury maximum diameter mile below Baileys millimeters Miocene moderately narrow Oak Grove Oak Grove sand obliquely obscure obtuse Occurrence Okaloosa County Outer lip outline pallial line paratype penult periphery pillar Plate posterior fasciole posterior margin posteriorly prominent protoconch radial ribs right valve sharply Shell Bluff Shell small Shoal River formation sinus slender slightly smooth specimens spiral sculpture spire striated subsp suture Trans Type locality U. S. Nat umbones valve cotype varix view of holotype volutions Wagner Free Inst Walton County