Science Progress, v. 1896, pp. 398-416.
Amer. J. Sci. (3) v. 1873, pp. 161, 162.
Op. cit. x. 1875, pp. 403-408.
Cat. Fossil Birds Brit. Mus. 1891, p. 200; id. A. Newton, Dict. Birds, 1894. p. 651.
This is very doubtful, as they show quite as many points of resemblance to other very different forms.