Parker, in his notes upon the osteology of the balaeniceps, this bird recalls the boatbill, the heron, and the adjutant.
"Scientific American Supplement, No. 829, November 21, 1891" by Various
Of the genus Cancroma one specimen was procured, the cinereous boatbill, which was killed at the senote at Chichen.
"Incidents of Travel in Yucatan, Vol. II." by John L. Stephens