Vokes, H. E., 1938. Upper Miocene Mollusca from Springvale, Trinidad, British West Indies. American Museum Novitates, 988.
New Species-Group Names:
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couvaensis Vokes, 1938. pl. 18. f. 16.
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maga Vokes, 1938. pl. 19. f. 17.
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medialira Vokes, 1938. p. 18. f. 18.