There have been recently discovered in the coal measures of Mississippi basin some excellently preserved remains of Cephalopods, which are remarkable on account of the huge size attained. Both are representatives of the retrosiphonate Nautoidea; but one is a member of the most closely coiled end of the series, while the other is a perfectly straight form. The former belongs to the genus Nautilus and the latter to Orthoceras.
Proceedings of the Iowa Academy of Sciences
©1895 Iowa Academy of Science, Inc.
Keyes, Charles R.
"Two Remarkable Cephalopods from the Upper Paleozoic,"
Proceedings of the Iowa Academy of Science, 3(1), 76-78.
Available at: https://scholarworks.uni.edu/pias/vol3/iss1/22