Occasional Papers of the Museum of Zoology: no. 596, 600-609, 612, 615-616, 618-628 from the University of Michigan includes various informative papers starting with “Two New Pleurocerid Snails from Eastern Mexico” by Fred G. Thompson, which details the discovery and classification debate surrounding two distinct species of Lithasiopsis snails. This installment also features “A New Colubrid Snake of the Genus Geophis from Michoacan, Mexico” by Norman Hartweg; an analysis of the freshwater mollusk “Status of the Genus Gundlachia” by Paul F. Basch; a description of a new darter fish species, “Etheostoma Acuticeps, from the Tennessee River System” by Reeve M. Bailey; and further taxonomic notes and new species descriptions in “Dolichopus Correus, New Species, and Notes on Other Dolichopodidae” by George C. Steyskal. The series continues to deliver significant findings and taxonomic reviews, adding to the breadth of knowledge in zoology.