Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . ADRULUS. lLATK LXII. DESCRIPTK N Shell narrowed, compressed, and thin behind; short,obtuse1, rounded, and wider before; beaks slightlyelevated; ligament more elevated than the beaks;binge margin compressed, carinate; basal marginfalcate, emarginate and compressed; posterior mar-gin subangulate; posterior dorsal margin subtrun-cate, nearly straight; posterior basal inarLrin project-ing; epidermis dark brown in obi specimens, ol anolive-colour in others; surface with distinct irregulart
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . ADRULUS. lLATK LXII. DESCRIPTK N Shell narrowed, compressed, and thin behind; short,obtuse1, rounded, and wider before; beaks slightlyelevated; ligament more elevated than the beaks;binge margin compressed, carinate; basal marginfalcate, emarginate and compressed; posterior mar-gin subangulate; posterior dorsal margin subtrun-cate, nearly straight; posterior basal inarLrin project-ing; epidermis dark brown in obi specimens, ol anolive-colour in others; surface with distinct irregulartransversely compressed tubercles; a broad, nodulous,elevated, somewhat double ridge extending from thebeaks to the [>osfenor basal edge, and a furrow be-hind, separating the posterior hinge and [losteriordorsal margin: (animal teeth sukatcd; lateral teethstriated, rough, and in th» righl valve somewhatdouble; anterior muscular impression deep and partlyrough; eavit\ of the beaks angular, compressed, anddirected forwards under the cardinal tooth; nacrepearly white, and on the posterior side
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836