Study of sections and by serial grinding indicates that fossils described by R. Rezak as new dasycladaceans from Silurian localities of the southwestern United States (Colorado School Mines, Quart. Vol. 54, p. 117-129, 1959) are portions of stems of crinoids resembling European species belonging to the Crotalocrinidae and the Polypeltidae.

You do not currently have access to this article.