IV.?A Contribution to the Study of the British Carboniferous Tubicolar Annelida1

The study of the Pal?ozoic Tubicolar Annelides has not received that amount of attention which the importance of the Order, either from a geological or zoological point of view, appears to demand. True it is that many interesting and instructive papers and memoirs have from time to time appeared, containing descriptions of species, and occasionally of genera; but, so far as I know, at any rate in this country, no connected account of either Silurian, Devonian, or Carboniferous Tubicolar Annelida has appeared.