Ortmann, A.E. 1918. The systematic position of two species of mussels from the Ozarks. Nautilus 32(1): 13-15. Available electronically.
Ortmann, 1918. Nautilus 32(1): 14.
(error for Unio conradicus Lea, 1834)
+ Lampsilis brittsi Simpson, 1900
+ Unio multiradiatus Lea, 1829
+ Unio conradicus Lea, 1834