Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . l. 10UNIO METANEVRUS. Plate V.—Fig. Shell suboval, thick, ventricose; anterior side tu-berculated, except near the margin, which is smooth;disk with an oblique furrow; umbonial slope veryprominent, broad and rounded, with numerous tu-bercles, some of which are very large; posterior slopewide, concave, or angular, with oblique slightly re-curved series of rib-like tubercles; umbo slightlyprominent; beaks retuse; ligament margin oblique,rounded at the extremity; posterior
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . l. 10UNIO METANEVRUS. Plate V.—Fig. Shell suboval, thick, ventricose; anterior side tu-berculated, except near the margin, which is smooth;disk with an oblique furrow; umbonial slope veryprominent, broad and rounded, with numerous tu-bercles, some of which are very large; posterior slopewide, concave, or angular, with oblique slightly re-curved series of rib-like tubercles; umbo slightlyprominent; beaks retuse; ligament margin oblique,rounded at the extremity; posterior margin emargi-nate; epidermis yellowish-brown, with interruptedgreen rays; within white, much thickened anteriorly. SYNONYMES. U. metanevra, Raf. Ann. gen. des Sc Phjs. vol. v. p. 39. Ferussac, Mag. de nodosus, Barnes. Sillimans Journal, vol. vi. p. 124, pi. vi. fig. Jl. N. S. No. 1754. OBSERVATIONS. A common species in the western and southernrivers, easily recognised, when in perfection, by itsswelling umbonial slope: very old specimens muchresemble U. stapes, Lea, but are much
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
