Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . Unto , %%. Unio &af 43 pression situated immediately beneath the tip of thelamelliform teeth, in having the anterior [posterior]lunule much more depressed, with slightly elevatedlines crossing the wrinkles.* It also differs in hav-ing a purple interior, varying from an intense shadeof that colour, approaching an indigo blue, to a palereddish-purple. The great thickness of the superiorportion of the shell causes the cavity of the umbo tobe very
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . Unto , %%. Unio &af 43 pression situated immediately beneath the tip of thelamelliform teeth, in having the anterior [posterior]lunule much more depressed, with slightly elevatedlines crossing the wrinkles.* It also differs in hav-ing a purple interior, varying from an intense shadeof that colour, approaching an indigo blue, to a palereddish-purple. The great thickness of the superiorportion of the shell causes the cavity of the umbo tobe very shallow. Common in the tributaries of the Ohio, UpperMississippi, and Missouri. In Alabama, I found itonly in the Tennessee and its tributaries. It is acommon species in the mountainous region of NorthCarolina and Virginia, where, from a poverty of cal-careous matter, it is always comparatively cuprea and U. atroviolacea, Raf., appear from thedescriptions to be mere varieties of U. dilatatus. UNIO TUBERCULATUS. Plate Shell subquadrangular, convex, thick; disk coveredwith irregular tubercles, except towards the
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
