Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . nte-riorly, inflated over the umbonial slope, which is pro-foundly angulated and subrectilinear; posterior slopeflattened or slightly concave, much wrinkled; umboinflated, prominent, sloping anteriorly, distant fromthe anterior margin; surface glabrous, olive-yellow;within bluish; cardinal teeth double in each valve,very oblique, compressed, elevated. SYNONYMES. U. ovatus, Say. Nicholsons Ency. (3d Amer. ed.) art. Conch. pi. ii. fig. 7. Lam. An. sans vert. vol. vi. p. A. N. S.
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . nte-riorly, inflated over the umbonial slope, which is pro-foundly angulated and subrectilinear; posterior slopeflattened or slightly concave, much wrinkled; umboinflated, prominent, sloping anteriorly, distant fromthe anterior margin; surface glabrous, olive-yellow;within bluish; cardinal teeth double in each valve,very oblique, compressed, elevated. SYNONYMES. U. ovatus, Say. Nicholsons Ency. (3d Amer. ed.) art. Conch. pi. ii. fig. 7. Lam. An. sans vert. vol. vi. p. A. N. S. No. 1225. OBSERVATIONS. The great depression of the posterior slope distin-guishes this species from the cardium, Raf. Oldshells are produced posteriorly. It varies consider-ably in form; some specimens are compressed, othersvery ventricose, with rather broad radii over thewhole disk. This variety is so dissimilar to thespecimen figured, that I propose to designate it bya distinct name, terming it variety ornatus; it is com-mon in the rivers of South Alabama. The species iscommon in the western waters. z.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
