BioStor
 | Zoological Society (1845) Annals And Magazine of Natural History 16: 253-273 |
 | Tertiary and Pleistocene Mollusca from the Galapagos Islands William Healey Dall and Washington Henry Ochsner (1928) Proceedings of the California Academy of Sciences 17: 89-139 |
 | Pliocene fossils from Baltra (South Seymour) Island, Galápagos islands Leo George Hertlein (1972) Proceedings of the California Academy of Sciences 39: 25-46 |