Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . acutissimus,and has more obvious beaks, but young individualsmuch resemble the latter species, as may be observedin fig. 4. In some specimens the posterior undula-tions are large and profound, in others more nume-rous and not so distinct. UNIO INTERRUPTUS. Plate Shell subtriangular, disks flattened; umbones broad,flattened, summits obtusely rounded; posterior slopemuch depressed; umbonial slope abruptly rounded,nearly terminal; epidermis brownish-yellow, wrinkled,e
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . acutissimus,and has more obvious beaks, but young individualsmuch resemble the latter species, as may be observedin fig. 4. In some specimens the posterior undula-tions are large and profound, in others more nume-rous and not so distinct. UNIO INTERRUPTUS. Plate Shell subtriangular, disks flattened; umbones broad,flattened, summits obtusely rounded; posterior slopemuch depressed; umbonial slope abruptly rounded,nearly terminal; epidermis brownish-yellow, wrinkled,except on the umbo; rays numerous, narrow, inter-rupted, of a dark olive colour; on the umbonial andposterior slopes consisting of series of small quad-rangular spots; within white; cardinal and lateralteeth very robust; anterior and posterior muscularimpressions deeply impressed. SYNONYMES. U. interrupta, Ruf. Ann. gen. des Sc. Phys., vol. v. p. 36. Say. Amer. Conch., No. 6. Ferr. Mag. de brevidens, Lea. Trans. Amer. Phil. Soc, new series, vol. iv. p. 75, pi. vi. fig. J. N. S., No. 1114. 48.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
