For a number of years the embryology of the Cyrenidae has been attracting considerable attention, but little has been added to our knowledge of the general anatomy since Dr. Franz Leydig's publication in 1855 (No. 5), who recorded such anatomy as could be made out from young and rather transparent specimens.
Proceedings of the Iowa Academy of Sciences
©1895 Iowa Academy of Science, Inc.
Drew, Gilman A.
"The Anatomy of Sphaerium sulcatum Lam.,"
Proceedings of the Iowa Academy of Science, 3(1), 173-182.
Available at: https://scholarworks.uni.edu/pias/vol3/iss1/36