Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . d, very smooth andpolished, with a few narrow dark green rays poste-riorly, more numerous on the posterior slope; umboprominent, decorticated; umbonial slope angulated;ligament margin elevated; ligament prominent; basalmargin swelling posteriorly; within white; cardinalteeth double in each valve, prominent, oblique. SYNONYMES. U. cariosus, Say. Nich. Enc. (Amer. ed.) art. Conch, pi. iii. fig. 2. luteola, Lam. An. sans vert. vol. vi. p. ovatus, A. N. S. No.
Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ... . d, very smooth andpolished, with a few narrow dark green rays poste-riorly, more numerous on the posterior slope; umboprominent, decorticated; umbonial slope angulated;ligament margin elevated; ligament prominent; basalmargin swelling posteriorly; within white; cardinalteeth double in each valve, prominent, oblique. SYNONYMES. U. cariosus, Say. Nich. Enc. (Amer. ed.) art. Conch, pi. iii. fig. 2. luteola, Lam. An. sans vert. vol. vi. p. ovatus, A. N. S. No. 1022. OBSERVATIONS. This is one of the most abundant species in thetide waters of the middle states, but I found it com-paratively rare in the Potomac and James rivers. Invarieties of form it much resembles U. crassus, andboth male and female are represented, in order toconvey a clear idea of sexual differences, which areso striking in a large proportion of the species. Itis very often destitute of rays, and I have seen onlyone specimen in which the rays extended over thedisk to the anterior margin. 0>. /:!. |
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Keywords: ., bookcentury1800, bookdecade183, booksubjectmollusks, bookyear1836
