Limnadia, a new genus of Crustacea, iv, 372.
Trilobite, a supposed recent, from N. S. Shetland, xxvii, 395.
—, nature of, J. Green, xxiii, 396; xxxvii, 25.
Trilobites.
*Asaphus astragalotes, xxv, 335.
*— diurus, xxxvii, 40.
*— limulurus, xlviii, 309.f
*— myrmecoides, xxiii, 397.
*— platypleurus, xxxii, 169.
*— polypleurus, xxxiv, 380.