46 University of Kansas Geological Survey. 



die, as though for a spur. The specimen, which comprises 

 a considerable portion of the skeleton, was first described 

 as the type of the genus Lestornis. Marsh, later, thought 

 that the roughening might be a sexual character. 



U. gracilis Marsh, Amer. Journ. Sci., xi, 510, 1876. 



This species, of smaller size than the preceding, is known 

 from the nearly complete skeleton, according to Marsh, 

 but has never been adequately described. 



Baptornis. 



Marsh, Amer. Journ. Sci., xiv, 86, July, 1877. 

 J3. advenus Marsh, Amer. Journ. Sci., 1. c, 1877. 



The type specimen, upon which this species and genus were 

 based, was collected by a member of the writer's party 

 in the yellow chalk. The generic difference is chiefly 

 based upon the small size of the outer metatarsal. 



CARINAT^E — Oclontotormae. 

 Ichthyornis. 



Marsh, Amer. Journ. Sci., rv, 344, Oct., 1872. 



I. dispar Marsh, 1. c, 1872. 



The type specimen of this species was discovered, as already 

 explained, by Mudge in 1872. It is, perhaps, the most 

 complete specimen of this group that has ever been found, 

 and the first of any known birds that showed the pres- 

 ence of teeth in the jaws. The teeth were first described 

 as belonging to a reptile, by Marsh, in the Amer. Journ. 

 Sci. for November, 1872, under the name Colonosaurus 

 mudgei. The species is at present known from nearly 

 the complete skeleton. 



I. agilis Marsh, Amer. Journ. Sci., v, 230, 1873 (Graculavus). 



This species was based on very imperfect material discov- 

 ered by Marsh in 1872, and has never yet been adequately 

 described or figured, so that its determination, save by 

 comparison with the type, will be more or less doubtful. 



