Report of the Librarian. 
xliii 
Katzer, F. Das altere Paleozoicum in Mittelbohmen und die 
Nothwendigkeit einer Neueintheilung Desselben. 
Keyes, C. R. The Petrography and Structure of the Piedmont 
Plateau in Maryland. 
-Fossil Faunas in Central Iowa. 
-Proposed Economical Geological Survey of Iowa. 
—— Genesis of the Actinocrinidse. 
-Lower Carboniferous Gasteropoda from Burlington, Iowa. 
The American Species of Polyphenopsis. Sphaerodoma; a 
Genus of Fossil Gasteropods. (Two Copies.) 
-A Geological Section Across the Piedmont Plateau in 
Maryland. (A supplement to a paper by G. H. Williams, 
entitled “The Petrography and Structure of the Piedmont 
Plateau in Maryland.) 
—— Stratigraphy of the Carboniferous in Central Iowa. 
-The Naticoid Genus Strophostylus. 
-Surface Geology of Burlington, Iowa. 
-Discovery of Fossils in the Limestones of Frederick 
County, Maryland. 
-The Sedentary Habits of Platyceras. 
-An Annotated Catalogue of the Mollusca of Iowa. 
-Review of the Progress of American Invertebrate Paleon¬ 
tology for the Year 1890. 
-Remarks on the Perisomic Plates of the Crinoids. 
- The Bedrock Sandstone of Marion County, Iowa. 
-Soleniscus; its Generic Characters and Relations. 
- Certain Forms of Straparollus from Southeastern Iowa. 
-Review of the Progress of American Invertebrate Paleon¬ 
tology for the Year 1889. 
-The Coal Measures of Central Iowa, and Particularly in 
the Vicinity of Des Moines. 
King, Franklin H. Observations and Experiments on the 
Fluctuations in the Level and Rate of Movement of Ground 
Water on the Wisconsin Agricultural Experiment Sta¬ 
tion Farm and at Whitewater, Wis. 
Kingsley, J. S. Carcinological Notes. No. 5. 
-Problems for Zoologists. 
-Some Points in the Development of Molgula Manhattanensis. 
