SYSTEMATIC SYNOPSIS OF FOSSIL BIRDS. 1095 



ICHTHYOKNIS DISPAK, 



Ichthyornis dispar Marsh, Am. Journ. Sci. iv, Oct. 1872, p. 344. — Id. ibid. \, Feb. 

 1873, p. IGl. — Id. ibid. Mar. 187.3, p. 230. — Couks, Key, 1872, p. 350. — Owen, Journ. 

 Geol. Soc. Loud, xxxix, 1873, p. 520. —Wood w. Pop. Sci. Eev. Oct. 1875, p. 348. — Marsh, 

 Am. Nat. ix, Dec. 1875, p. 625. —Id. Geol. Mag. iii, 1876, p. 49. — Huxl. Pop. Sci. Monthly, 

 X, 1876, pp. 215-218. — Marsh, Journ. de Zool. iv, 1875, p. 494, pi, xv; vi, 1877, p. 385.— 

 Id. Odont. 1880, pp. 1 19-183, 197, pis. xxi-xxvi. 



This remarkable bird, forming a type of the group Odontotormfe (p. 243), with general 

 characters of the skeleton like those of ordinary birds, yet with socketed teeth and biconcave 

 vertebrae, was discovered in 1872 near the Solomon River in northwestern Kansas, in the Pte- 

 ranodon beds of the middle Cretaceous. It was about as large as a Pigeon. The remains 

 of about nine individuals, all from tlie same region, are preserved in the Museum at Yale 

 College. 

 ICHTHYORNIS AGILIS. 



Graculavus ugilis Marsh, Am. Journ. Sci. v. Mar. 1873, p. 230. 



Ichthyornis agilis Marsh, Odont. 1880, p. 197. 



From the same horizon in western Kansas, on Butte Creek, a tributary of the Smoky 

 Hill River, where discovered in October, 1872. The remains are preserved in the Yale College 

 Museum. 

 ICHTHYORNIS ANCEPS. 



Graculavus anceps Marsh, Am. Journ. Sci. iii, May, 1872, p. .364. — Couks, Key, 

 1872, p. 3.j0. — Marsh, Am. Journ. Sci. v. Mar. 1873, p. 229. — Id. Odont. 1880, pp. 

 124, 198. 



Resembling I. dispar, but with slenderer jaws and more teeth. The right lower jaw of 

 the type specimen of I. dispar shows twenty-one distinct sockets. Discovered in November, 

 1870, in the gray shale of the middle Cretaceous, on the north fork of the Smoky Hill River in 

 western Kansas, where other specimens have since been found. All are preserved at Yale. 

 ICHTHYORNIS LENTUS. 



Graculavus lentus Marsh, Am. Journ. Sci. xiv. Sept. 1877, p. 253. 



Ichthyornis lentus Marsh, Odont. 1880, p. 198. 



Based upon part of a tarso-metatarsus from near Fort McKinney, Texas, in beds of middle 

 Cretaceous age. Deposited in the Yale Museum. 

 ICHTHYORNIS TENER. 



Ichthyornis tener Marsh, Odont. 1880, p. 198, pi. xxx, fig. 8. 



From the Pteranodon beds of the middle Cretaceous, Wallace County, Kansas ; two speci- 

 mens, secured in 1876, and now pre.served at the Yale College Museum. 

 ICHTHYORNIS VALIDUS. 



Ichthyornis ralidus .Marsh, Odont. 1880, j). 198, \)\. x.kx, figs. 11-14. 



Discovered in 1877, in the yellow chalk of the middle Cretaceous, near Solomon River, in 

 northwestern Kansas. The known specimens are deposited in the Museum of Yale College. 

 ICHTHYORNIS VICTOR. (See p. ()4, fig. 16.) 



Ichthyornis victor Marsh, Am. Journ. Sci. xi, June, 1876, p. 511. — Id. Odont. 1880, 

 p. 199. pis. xxvii-xxxiv. — Dana, Man. Geol. 1880, pp. 466-468, pi. v. 



A species of the genus rather larger than a Pigeon, of which more than forty specimens 

 have been found in various localities in Kansas, all apparently from the same geological horizon 

 in till' middh' Cretaceous. These are preserved in tlie Museum of Yale College. 

 LAORNIS EDVARDSIANUS. 



Lnornis edvardsianus Marsh, Proc. Phila. Acad. Jan. 1870, p. 5. — Id. Am. Journ. Sci. 

 xlix. Mar. 1870, p. 206. — Id. ibid, v, Mar. 187.3, p. 230. - A. Miln'K-Edw. Roch. Ossem. 

 Foss. ii, 1871, p. 540. — CouES, Key, 1872, p. 350. — Marsh, Odont. 1880, p. 199. 



