Pilsbry, H. A. (1927). The structure and affinities of Humboldtiana and related helicid genera of Mexico and Texas. Proceedings of the Academy of Natural Sciences of Philadelphia. 79: 165-192, plates 11-14.
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Pilsbry, H. A.
1927
The structure and affinities of <i>Humboldtiana</i> and related helicid genera of Mexico and Texas.
Proceedings of the Academy of Natural Sciences of Philadelphia