Recently while the writer was sorting some collections which he and some of his students had gathered a few years ago at Monticello, he came upon a specimen of the rare crinoid Herpetocrinus. The specimen was almost wholly covered by the matrix and it was removed only after much patient cleaning. Further search among the material added three short pieces of stems while a drawer of specimens from the same locality, collected by Mr. J. V. Henley about 1907, contains a coiled stem labeled, "Crinoid stem, Monticello, Iowa, J. V. H." This, too, belongs to Herpetocrinus. As far as known, this is the first reported occurrence of this very unique crinoid from the Iowa Silurian.
Proceedings of the Iowa Academy of Science
©1919 Iowa Academy of Science, Inc.
Thomas, A. O.
"A Herpetocrinus from the Silurian of Iowa,"
Proceedings of the Iowa Academy of Science, 26(1), 481-483.
Available at: https://scholarworks.uni.edu/pias/vol26/iss1/46