Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . NIO HETERODON. Plate XLIX.—Fig. 3. DESCRIPTION. Shell rhomboidal-ovate, ventricose, valves thin;ligament margin short, elevated, parallel with thebasal margin; umbonial slope rounded; beaks decor-ticated; basal margin straight in the middle; posteriorextremity rounded or very obtusely angulated, a littleabove the line of the base; within bluish; cardinaltooth in the left valve trilobed; in the right valve,single, elongated, oblique, compressed; lateral teethslightly curved, double in
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . NIO HETERODON. Plate XLIX.—Fig. 3. DESCRIPTION. Shell rhomboidal-ovate, ventricose, valves thin;ligament margin short, elevated, parallel with thebasal margin; umbonial slope rounded; beaks decor-ticated; basal margin straight in the middle; posteriorextremity rounded or very obtusely angulated, a littleabove the line of the base; within bluish; cardinaltooth in the left valve trilobed; in the right valve,single, elongated, oblique, compressed; lateral teethslightly curved, double in the right valve. SYNONYME. U. heterodon, Lea. Trans. Amer. Phil. Soc, new series, vol. iii. p. 428, pi. viii. fig. A. N. S., No. 20425. OBSERVATIONS. Inhabits the Schuylkill and other rivers in Penn-sylvania. This interesting little species was firstfound by Messrs. Mason and Hyde, and my fathersuggested the name of heterodon, which Mr. Lea hasadopted. It is related to V. viridis and compressus,but the double cardinal teeth being in the right valvewill distinguish it from every other species. 49.
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
