198 APPEXDIX. 



Ichthyornis anceps, Marsh. 



Graeulavus aneeps, Marsh. — American Journal Science, Vol. Ill, p. 364, May, 



1872 ; Vol. V, p. 229, March, 1873. 

 Coues, Key to North American Birds, p. 350, 1872. 

 Marsh, This volume, p. 124. 



The type specimen (number 1208) of Ichthyornis anceps was found 

 by the writer in November, 1870, on the North Fork of the Smoky Hill 

 River, about twelve miles east of Fort Wallace, Kansas. The geological 

 horizon was in the gray shale of the middle Cretaceous. Other specimens 

 referred to this species have since been secured from the same region. 



All the known specimens are in the Yale College Museum. 



Ichthyornis celer, see Apatornis celer. 

 Ichthyornis lentus, Marsh. 



Graeulavus lentus, Marsh. — American Journal Science and Arts, (3) Vol. XIV, 

 p. 253, Sept., 1877. 



This species is based on the lower half of a tarso-metatarsal bone 

 (number 1796), obtained by Prof. B. F. Mudge, near Fort McKinney, 

 Texas, in 1876. The accompanying fossils indicate that the locality was 

 in beds of middle Cretaceous age. 



This specimen is in the Museum of Yale College. 



Ichthyornis tener, Marsh. 



(Plate XXX, figure 8.) 



The type specimen (number 1760) of the present species was found 

 in 1879, by Mr. E. W. Griiild, in Wallace County, Kansas. A second speci- 

 men (number 1766) was secured about the same time, in the same region. 

 The locality was in the Pteranodon beds, of the middle Cretaceous. 



The known remains of this species are in the Yale College Museum. 



Ichthyornis yalidus, Marsh. 



(Plate XXX, figures 11-14) 



The type of Ichthyornis validus (number 1740) was discovered in 

 Seotember, 1877, by Mr. S. W. Williston, near the Solomon River, in 

 northwestern Kansas. The locality was in the yellow chalk of the middle 

 Cretaceous. 



All the specimens known belonging to this species are in the Yale 

 College Museum. 



