Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . S0^ , . M Sax Del. CTiehovU S, 107 OBSERVATIONS. This shell may readily be distinguished from by its darker, less polished, more wrinkledepidermis, more regular convexity of the disks, andby the rays extending over the whole surface, whichis very rarely the case with the former; the plicatedbeaks constitute another point of difference. Twospecimens were sent me from Illinois by Dr. Fussel,who found them in the upper part of White river. UNIO HEROS. Plate
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . S0^ , . M Sax Del. CTiehovU S, 107 OBSERVATIONS. This shell may readily be distinguished from by its darker, less polished, more wrinkledepidermis, more regular convexity of the disks, andby the rays extending over the whole surface, whichis very rarely the case with the former; the plicatedbeaks constitute another point of difference. Twospecimens were sent me from Illinois by Dr. Fussel,who found them in the upper part of White river. UNIO HEROS. Plate Shell oval, somewhat oblong, with large distinctundulations, three or four in number, directed to-wards the posterior margin, and not proceeding di-rectly from the umbo; surface with a few abbreviatedtransverse lines, placed without any regularity; umboplaced far forward, not prominent, hardly elevatedabove the general curvature, more or less literatewith short irregular lines or slight elevations; hingemargin compressed, nearly rectilinear, prominentlyangulated or subalated at tip; in the more perfectsp
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
