Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . acilis, Barnes. Sillimans Journ. vol. vi. p. 174. U. fragilis, Stvains. Symphynota gracilis, Lea. Trans. Amer. Philos. Soc. new se-ries, vol. iii. p. 66. Cab. Ji. N. S. No. 1657. OBSERVATIONS. Allied to U. alatus, but is longer in proportion,thinner, and lighter coloured in the interior and epi-dermis. In some localities the wing is small, but inothers generally elevated. Found by Mr. Schoolcraft in Fox river; it inhabitsthe Detroit river, Michigan, lakes, and the westernrivers genera
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . acilis, Barnes. Sillimans Journ. vol. vi. p. 174. U. fragilis, Stvains. Symphynota gracilis, Lea. Trans. Amer. Philos. Soc. new se-ries, vol. iii. p. 66. Cab. Ji. N. S. No. 1657. OBSERVATIONS. Allied to U. alatus, but is longer in proportion,thinner, and lighter coloured in the interior and epi-dermis. In some localities the wing is small, but inothers generally elevated. Found by Mr. Schoolcraft in Fox river; it inhabitsthe Detroit river, Michigan, lakes, and the westernrivers generally, and I found it common in the Ala-bama at Claiborne. UNIO ALATUS. Plate XXXI. DESCRIPTION. Shell triangular, ovate, moderately thick; disksflattened anteriorly, and inflated over the umbonialslope; anterior side narrow, margin obliquely recti-linear above; posterior side profoundly dilated, andrising into an elevated connate wing; umbo oblique,inclined, not prominent; posterior lunule with twosubangulated lines; umbonial slope regularly rounded;wing emarginate inferiorly; posterior end biangulated; 3). :niit , iSin CONTENTS Plate XXVI. Unio niger.,, XXVII. Unio gibbosus.„ XXVIII. Unio teres. yyiy 5 Fig. 1, Unio Sageri. AA1A) „ 2, Unio lapillus.,, XXX. Unio fragilis. Erratum.—Page 53, tenth line from bottom, for extremely obtuse,read extremity obtuse. NEW FRESH WATER SHELLS OF THE UNITED STATES, &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. JVo. 7. MONOGRAPHY OF THE 0 FAMILY UNIONID^, OR NAIADES OF LAMARCK,(FRESH WATER BIVALVE SHELLS,) OF NORTH AMERICA, ILLUSTRATED BY FIGURES DRAWN ON STONE FROM NATURE. BY T. A. CONRAD, CURATOR OF THE ACADEMY OP NATURAL SCIENCES OF PHILADELPHIA, HONORARY MEMBER OFTHE GEOLOGICAL SOCIETY OF PENNSYLVANIA. PHILADELPHIA: J. DOBS
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
