Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . ,.- Unio #o,-. 1? UNIO COSTATUS. Plate Shell suboval, slightly ventricose anteriorly; diskwith profound oblique undulations, numerous and re-curved behind the umbonial slope; umbo narrow,slightly prominent, oblique, nearly terminal; ligamentmargin elevated, nearly straight; epidermis yellowishbrown, sometimes blackish brown, much wrinkledposteriorly; within white, iridescent posteriorly,waved on the margin; cardinal teeth very thick. SYNONYMES. U. costatus,
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . ,.- Unio #o,-. 1? UNIO COSTATUS. Plate Shell suboval, slightly ventricose anteriorly; diskwith profound oblique undulations, numerous and re-curved behind the umbonial slope; umbo narrow,slightly prominent, oblique, nearly terminal; ligamentmargin elevated, nearly straight; epidermis yellowishbrown, sometimes blackish brown, much wrinkledposteriorly; within white, iridescent posteriorly,waved on the margin; cardinal teeth very thick. SYNONYMES. U. costatus, Raf. Ann. gen. des Sc. Phys. vol. v. p. 49. pi. lxxxii. fig. 13,14. Poulsons trans, p. 57. Say, Amer. Conch. No. 6. Ferus. Mag. de undulatus, Barnes. Sillimans Journ. vol. vi. p. 121, pi. 2. OBSERVATIONS. This shell very nearly approaches U. plicatus, Say,and some varieties can scarcely be distinguishedfrom it. It has, in general, more undulations, a muchless prominent umbo, is less ventricose, and has oftena yellowish epidermis, which is not the case with theplicatus. Not uncommon in the western
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
