Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . FORMIS. Plate XL.—Fig. Shell sub-oval, slightly ventricose, moderatelythick; posterior side flattened or very slightly grooved;umbonial slope obtusely angulated; basal marginrounded medially, straight or slightly emarginateposteriorly; posterior extremity direct, truncated,narrowed, slightly produced; summits obtusely round-ed, not prominent; epidermis yellowish, with nume-rous narrow unequal green rays; within white; cardi-nal teeth very erect and prominent. SYNONYME.
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . FORMIS. Plate XL.—Fig. Shell sub-oval, slightly ventricose, moderatelythick; posterior side flattened or very slightly grooved;umbonial slope obtusely angulated; basal marginrounded medially, straight or slightly emarginateposteriorly; posterior extremity direct, truncated,narrowed, slightly produced; summits obtusely round-ed, not prominent; epidermis yellowish, with nume-rous narrow unequal green rays; within white; cardi-nal teeth very erect and prominent. SYNONYME. U. capsvEformis, Lea. Trans. Amer. Philos. Soc, new series, vol. iv. p. 145, pi. ii. fig. A. N. S. No. 20414. OBSERVATIONS. Inhabits Cumberland river near Nashville, Tennes-see. I have found it in the Tennessee river at Flo-rence, Alabama. It bears a slight resemblance tothe young of , and is a very distinct spe-cies. The female is represented in figure 3. Be-tween the sexes the difference in outline is greaterthan in any species with which we are acquainted,except U. gibbosus, Raf. 40.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
