American Marine Conchology Or Descriptions of the Shells of the Atlantic Coast
American Marine Conchology Or Descriptions of the Shells of the Atlantic Coast
George Washington Tryon
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) 128 AMERICAN MARINE CONCHOLOGY. Genus DIPLOTHYRA, Tryon. Proc. Philad. Acad. 1862. 1. D. SMITHII, Tryon. Fig. 269. Proc. Philad. Acad. 1862. Shell short, ovate, divided in the middle by an oblique im- pressed line, posterior to which the surface is covered with growth lines only, but anteriorly it is finely and sharply transversely sculptured, and obsoletely, radiately ribbed in some specimens ; the umbonal plates are generally much distorted, so that no par- ticular form can be traced throug...hout all the specimens, though the more perfect approach to that depicted in the magnified figure. Transverse axis 15, vertical 10 mill. (Burrowing in oyster shells. ) Tottenville, Staten Island, N. Y. Family GASTROCELENID. ^, Gray. Zool. Proc. London. 1858. Genus ROCELLAKIA, Fleuriau de Bellevue. (Rupettaria. ) Journ. De Physique. , liv. 1802. Gastrochcena (partim) Auct. Shell regular, equivalve; valve* ovate or cuneiform, widely gaping anteriorly, very unequilateral ; umbones anterior, ligament long and narrow ; pallial line lightly impressed, sinuated, uniting the muscular impressions ; tube claviform or irregular, often in- complete, perforating shells and limestone, to which its walls are sometimes adherent.
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