Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . PhUflfsiLj Con. &. Unto M&tancurus> Dec. /. ?/nu>Mprfpni-, ; fragpsus (oftraJ 11 UNIO MORTONI. Plate VI.—Fig. 1. DESCRIPTION. Shell suborbicular, not thick, ventricose; disk flat-tened, or slightly furrowed from beaks to base, co-vered with irregular tubercles; anterior margin sub-truncated; posterior margin straight, direct; ligamentmargin subarcuate, oblique, forming an angle withthe posterior margin; umbo with an oblique furrow,prominen
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . PhUflfsiLj Con. &. Unto M&tancurus> Dec. /. ?/nu>Mprfpni-, ; fragpsus (oftraJ 11 UNIO MORTONI. Plate VI.—Fig. 1. DESCRIPTION. Shell suborbicular, not thick, ventricose; disk flat-tened, or slightly furrowed from beaks to base, co-vered with irregular tubercles; anterior margin sub-truncated; posterior margin straight, direct; ligamentmargin subarcuate, oblique, forming an angle withthe posterior margin; umbo with an oblique furrow,prominent; beaks rather retuse, decorticated; umbo-nial slope angular, slightly arcuate; posterior slopeflattened; epidermis yellowish brown, with fine crowd-ed wrinkles; within white; anterior margin not thick-ened; cardinal teeth compressed, very prominent,oblique. Cab. J. N. S. No. 1874. OBSERVATIONS. This pretty species is common in Bayou Teche,Louisiana; but I have seen it from no other locality;it approaches nearest to the (jiiadrulus, Raf., but dif-fers greatly in size, convexity, and want of a distinctfurrow from beak to base. It is dedicated to myfriend Dr. S.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
