—, see farther under [Zoology, Mollusca.]
Tetracaulodon, R. Harlan, xliii, 141.
—, xlv, 210.
—, R. Owen, xliv, 342.
Texas, lignite of, xxxvii, 216.
—, silicified wood of, xxxvii, 215.
—, hog-wallow prairies, notice of, xxxix, 211.
Thebaine, from opium, xxx, 379.
Thenard, L. J., system of Chemistry of, notice of, xx, 94.
Thenard, P., on the combinations of phosphorus and hydrogen, xlviii, 184.