Bartsch, P., and Rehder, H. A., 1939. Mollusks Collected on the Presidential Cruise of 1938. Smithsonian Miscellaneous Collections, 98 (10 ): 1 -18 .
New Species-Group Names:
- magdalenensis Bartsch & Rehder, 1939. p. 4. pl. i. f. 5. 9.
-
roosevelti Bartsch & Rehder, 1939. p. 3. pl. i. f. 4. 7.
