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12 45 Umbonium (Solariorbis) floridanum Dall Pliocene, Tola. Proc. U.S. Nat. Mus, XVIII, no. 1035, 1896, p. 45. Umbonium (Solariorbis) undula Dall Miocene, N. Car., Proc. U.S. Nat. Mus, XVIII, no. 1035, 1896, p. 46. Umbonium (Solariorbis) duplinense Dall, Miocene, Fla., Proc. U.S. Nat. Mus, XVIII, no. 1035, 1896, p. 46. *Genus Lepidodesma Simpson. Proc. U.S. Nat. Mus. XVIII, No. 1068, May 20th, 1896. p. 311. Unio subplanatus Simpson. Triassic. Proc. U.S. Nat Mus. XVIII, No. 1072, May 20th, 1896, p. 383, figs. 1-2 in text Unio dumblei Simpson. Triassic Proc. U.S. Nat. Mus. XVIII, No. 1072, May 20th 1896. p. 383. fig. 3, in text Unio graciliratus Simpson. Triassic. Proc. U.S. Nat. Mus. XVIII, No. 1072, May 20th 1896. p. 384, fig. 4 in text Unio dockumensis Simpson. Triassic Proc. U.s. Nat. Mus. XVIII, No. 1072, May 20th 1896. p. 384. fig. 5, in text.