Pilsbry, H. A., 1921. Revision of W. M. Gabb's Tertiary Mollusca of Santo Domingo. Proceedings of the Academy of Natural Sciences of Philadelphia, 73.
New Species-Group Names:
-
humerosus Pilsbry, 1921. p. 332. pl. 21. f. 4.
- maculospira Pilsbry & Johnson, 1921. p. 330.
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politispira Pilsbry, 1921. p. 327. pl. 19. f. 5.
- pseudomarginatus Pilsbry, 1921. p. 330.