SYSTEMATIC SYNOPSIS OF FOSSIL BIRDS. 1093 



sembling the same part in the Ostriches (Struthionidce) and Moas (Dinornithida;) ; while the 

 distal end, as far as that is preserved, is similar to that of Gastornis of the corresponding hori- 

 zon in France. 

 BARORNIS REGENS. 



Barornis regens Marsh, Am. Journ. Sci. xlviii, 1894, p. 344. 



From the Eocene of the vicinity of Squantum, New Jersey. 



H. — Cretaceous Jiirds, 



The following synopsis is based upon that given in the appendix of Marsh's great work 

 already cited (" Odontornithes "). The ten genera and twenty-three species presented are 

 supposed to be referable to one or the other of the two types exemplified by Ichthyornis and 

 Hesperornis respectively; but, as many of them are still known only by remains so fragmen- 

 tary that it is impossible to say whether they are Odontotorrmc or Odontolcce, an alphabetical 

 arrangement of the genera is followed. 



Most of the known remains of Cretaceous birds of North America have been discovered 

 on the eastern slopes of the Rocky Mountains, in beds of middle Cretaceous age which have 

 been termed by Marsh " Pteranodon beds," from the genus of toothless Pterodactyles found in 

 them. These Western Cretaceous birds were all found in Kansas, excepting some from cor- 

 responding strata in Texas. The Eastern Cretaceous forms from the green-sand of New 

 Jersey, all of which are distinct from the western ones, are from a higher horizon, representing 

 a division of the upper Cretaceous. No jaws or teeth of these birds having been found, it is 

 impossible to say as yet whether or not they are odontornithic All the deposits of Cretaceous 

 age in North America, in which birds have been found, are marine, and the species appear to 

 have all been aquatic. 

 APATORMS CELER. 



Ichthyornis celer Marsh, Am. Journ. Sci. v, Jan. 1873, p. 74. 



Apatornis celer Marsh, Am. Journ. Sci. v, Feb. 1873, p. 162. — Id. ibid, v, Mar. 1873, 

 p. 230. — Id. ibid, x, Nov. 1875, p. 404. — Id. Am. Nat. ix, Dec. 1875, p. 620. — Id. Geol. 

 Mag. iii, Feb. 1876, p. 50. — Woodav. Pop. Sci. Rev. Oct. 1875, p. 349. — Marsh, Odont. 

 1880, p. 192, pis. xxviii-xxxiii. 



A bird about the size of a Pigeon, from the middle Cretaceous of western Kansas ; related 

 to Ichthyornis. The two known specimens are preserved in the Yale Museum. 

 BAPTORNIS ADVENUS. 



Buptornis adveniis Marsh, Am. Journ. Sci. xiv, July, 1877, p. 8G. — Id. Journ. de 

 Zool. vi, 1877, p. 387. — Id. Odont. 1880, p. 192, figs. 37-39. 



Based upon a nearly perfect tarso-metatarsal, closely resembling the same part oi Hesper- 

 ornis, and indicating an aquatic bird about as large as a Loon. From western Kansas, in the 

 same Cretaceous beds with Odontornithes and Pteranodontia. The type, and a second speci- 

 men referred to the same species, are preserved in the Museum at Yale College. 

 CIMOLOPTERYX RARUS. 



Ciniiilopfrry.r rnrns .Marsh, Am. Journ. Sci. xliv, 1892, p. 175, pi. iii, fig. 2. 



Fri)iii till' Laramie beds nf NN'yuiniug. 

 CIMOLOPTERYX RETUSUS. 



Cimoloptery.v retusus >L\rsh, Am. Journ. Sci. xliv, 1892, p. 175. 



Frcim tlic Laramie bods of Wyoming. 

 COMORMS ALTITS. 



Coniornis altus >L\rsh, Am. Journ. Sci. xiv, 1893. p. 82. 



From the Cretaceous of the Judith River basin, in Mimtana. 



