Pilsbry, H. A. & Clapp, G. H. (1909). Notes on shells collected at Balsas, Guerrero, Mexico, by Mr. Walter E. Koch, in Dec., 1908. The Nautilus. 22(11): 114-115, pl. 8, figs. 5-6.
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Pilsbry, H. A. & Clapp, G. H.
1909
Notes on shells collected at Balsas, Guerrero, Mexico, by Mr. Walter E. Koch, in Dec., 1908