Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . undly emarginate posteriorly,as represented in the outline, fig. 3. UNIO OCCIDENTALS. Plate XXXVI.—Fig. 1. DESCRIPTION. Shell elliptical, convex, anterior margin very regu-larly rounded; anterior dorsal margin elevated; basalmargin straight and parallel with the ligament mar-gin; posterior margin oblique, extremity rounded;umbonial slope undefined; beaks slightly prominent,with undulated grooves; summit rounded; epidermisyellowish, with narrow green rays, which are obso-lete or wantin
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . undly emarginate posteriorly,as represented in the outline, fig. 3. UNIO OCCIDENTALS. Plate XXXVI.—Fig. 1. DESCRIPTION. Shell elliptical, convex, anterior margin very regu-larly rounded; anterior dorsal margin elevated; basalmargin straight and parallel with the ligament mar-gin; posterior margin oblique, extremity rounded;umbonial slope undefined; beaks slightly prominent,with undulated grooves; summit rounded; epidermisyellowish, with narrow green rays, which are obso-lete or wanting on the anterior side; within bluish;cardinal teeth direct, prominent, acute; lateral teethlamelliform. OBSERVATIONS. This shell has an outline similar to that of U. com-planatus. It differs from that species in its yellowepidermis, the peculiarity of its rays, more elevatedanterior margin, lamelliform lateral teeth, &c. Inhabits Currant river, Arkansas, whence it wasbrought by Mr. Featherstonhaugh, to whose kindnessI owe the use of this and several rare and beautifulspecies. 36 : i ^*- ___ i l i^.. ; o OcnidentalU, a. CONTENTS. Plate XXXII. Unio inflatus. „ XXXIII. Unio leptodon. „ XXXIV. Fig. 1, Unio ellipsiformis. ,, „ Fig. 2, Unio lienosus. ,, XXXV. Fig. 1, Unio stapes. ,, ,, Fig. 2, Unio intermedius. ,. XXXVI. Fig. 1, Unio occidentals, No. VIII. will be published in January. NEW FRESH WATER SHELLS OF THE UNITEDSTATES, &c. For sale by J. Dobson, a few copies of this work, which containscoloured illustrations of bivalve and univalve shells, and embraces amonography of the genus Anculotus. Most of the species describedin this book were obtained by the author in Alabama. NORTH AMERICAN HERPETOLOGY. Just Published, and for sale by J. Dobson, 108 Chesnut Street,NORTH AMERICAN HERPETOLOGY; OR A DESCRIPTION OP THE REPTILES INHABITING THE UNITED STATES. BY JOHN EDWARDS HOLBROOK, M. D. Professor of Anatomy in the Medical College of the State of South Carolina,
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
