S. A.  Miller, The American palaeozoic fossils: a catalogue of the genera and species, with names of authors, dates, places of publication, groups of rocks in which found, and the etymology and signification of the words, and an introduction devoted to the stratigraphic. Cincinnati, Ohio: Published by the author, 1877, p. 253.

S. A.  Miller, The American palaeozoic fossils: a catalogue of the genera and species, with names of authors, dates, places of publication, groups of rocks in which found, and the etymology and signification of the words, and an introduction devoted to the stratigraphic. Cincinnati, Ohio: Published by the author, 1877, p. 253.