About five years ago the writer published an annotated list of Iowa Mollusca under the title "The Mollusca of Eastern Iowa." Material has been secured since by which many of the species have been traced across the entire State, and which also throws much additional light on the synonymy of some of the species.
Proceedings of the Iowa Academy of Sciences
©1893 Iowa Academy of Science, Inc.
"Additional Notes on Iowa Mollusca,"
Proceedings of the Iowa Academy of Science, 1(Pt. 4), 107-111.
Available at: https://scholarworks.uni.edu/pias/vol1/iss4/36