Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . ase. It is dedicated to myfriend Dr. S. G. Morton, whose exertions have fur-nished a splendid collection of American and foreignfresh water shells to the Academy of Natural Sci-ences. 12UNIO FRAGOSUS. Plate VI.—Fig. Shell suborbicular, ventricose, with an indistinctnarrow furrow, and two approximate series of veryprominent irregular tubercles, anterior ones largest;umbonial slope angular; posterior slope slightly con-cave, with a few narrow rib-like tubercles, more pro-
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . ase. It is dedicated to myfriend Dr. S. G. Morton, whose exertions have fur-nished a splendid collection of American and foreignfresh water shells to the Academy of Natural Sci-ences. 12UNIO FRAGOSUS. Plate VI.—Fig. Shell suborbicular, ventricose, with an indistinctnarrow furrow, and two approximate series of veryprominent irregular tubercles, anterior ones largest;umbonial slope angular; posterior slope slightly con-cave, with a few narrow rib-like tubercles, more pro-minent near the margin; posterior margin direct,slightly emarginate; ligament slope straight, slightlyoblique; umbo narrow, prominent; beaks much in-curved, pointed, tuberculated; epidermis brown, withtwo or three broad, widely interrupted green rays. OBSERVATIONS. This fine species approaches guadrulus, Raf., butis much more ventricose, has more prominent tuber-cles, and is very distinct. I am indebted to for the splendid specimen represented bythe figure; it is from the Scioto river,
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
