Call, R. E. & Pilsbry, H. A. (1886). On Pyrgulopsis, a new genus of rissoid mollusk, with descriptions of two new forms. Proceedings of the Davenport Academy of Natural Sciences. 5: 9-14, pl. 2.
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Call, R. E. & Pilsbry, H. A.
1886
On <i>Pyrgulopsis</i>, a new genus of rissoid mollusk, with descriptions of two new forms.
Proceedings of the Davenport Academy of Natural Sciences