Maury, C.J. 1925. A further contribution to the paleontology of Trinidad. Bulletins of American Paleontology 10(42): 153-402. https://www.biodiversitylibrary.org/page/32509152#page/205/mode/1up.
Maury, 1925. Bull. Amer. Paleont. 10(42): 235 [83], pl. 13, fig. 2.