Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . urately does the abovementioned variety agree with Listers figure and de-scription, that I cannot doubt the identity. Thespecies is, perhaps, most closely allied to U. cariosus,its common associate in the Delaware and specimen figured has a double cardinal tooth ineach valve. UNIO xNASUTUS. Plate XVIII.—Fig. 1. DESCRIPTION. Shell elongated, compressed, thin; disks slightlyflattened; anterior side short; posterior side rostrated,tapering, angular at the extremity; umbo n
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . urately does the abovementioned variety agree with Listers figure and de-scription, that I cannot doubt the identity. Thespecies is, perhaps, most closely allied to U. cariosus,its common associate in the Delaware and specimen figured has a double cardinal tooth ineach valve. UNIO xNASUTUS. Plate XVIII.—Fig. 1. DESCRIPTION. Shell elongated, compressed, thin; disks slightlyflattened; anterior side short; posterior side rostrated,tapering, angular at the extremity; umbo not promi-nent; beaks small, eroded; umbonial slope profoundlyoblique, angulated; ligament margin rectilinear, ele-vated; posterior superior margin profoundly obliqueand slightly concave; within bluish, iridescent, rarelypurple or salmon; cardinal teeth compressed andoblique, double in each valve. SYNONYMES. U. nasutus, Say. Nich. Enc. (Amer. ed.) art. Conch, pi. U. ROSTRATA, ValetlC. Lister, tab. 151. fig. A. N. 1123. OBSERVATIONS. A common species in the tide waters from Florida.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
