192 APPENDIX. 



APATORNIS, 1 Marsh, 1873. 

 Apatornis celer, Marsh. 



(Plates XXVIII-XXXIII.) 



Ichthyornis celer, Marsh. — American Journal of Science, Vol. V, p. 74, Jan., 1873. 

 Apatornis celer, Marsh.— Vol. V, p. 162, Feb., 1873 ; Vol. V, p. 230, March, 1873; 

 Vol. X, p. 404, Nov., 1875. 



American Naturalist, Vol. IX, p. 626, December, 1875. 



Geological Magazine, Vol. Ill, p. 50, February, 1876. 

 Woodward, Popular Science Review, October, 1875, p. 349. 



The type specimen of this genus (number 1451) was discovered by 

 the writer in October, 1872, near the Smoky Hill Eiver, in Western Kansas. 

 The remains were imbedded in the yellow chalk of the Pteranodon beds, 

 a well marked horizon in the middle Cretaceous. 



A more perfect specimen (number 1734) was found in 1877, by Mr. 

 F. H. "Williston, a member of the writer's -party. The locality was near 

 the same river, and in the same geological horizon. 



Only these -two- specimens of the present species are known, and both 

 are deposited in the Museum of Yale College. 



BAPTORNIS,' Marsh, 1877. 



Baptornis advenus, Marsh. 



Marsh, American Journal of Science, Vol. XIV, p. 86, July, 1S77. 

 Journal de Zoologie, Tome VI, p. 387, 1877. 



The type specimen (number 1465) of the present species is a nearly 

 perfect tarso-metatarsal bone. This specimen, although pertaining to a 

 bird not fully adult, is in excellent preservation, and is so characteristic 

 that it may be readily distinguished from any forms already described. 



In general shape and proportions, this bone very nearly resembles 

 the corresponding part in Hesperomis, but differs from it decidedly in the 

 outer metatarsal, which at its lower end (figure 37, IV) scarcely equals 

 the adjoining one in size and length. In Hesperomis, on the contrary, the 

 puter metatarsal is more than double the size of the third. In the present 

 specimen, the three trochlear articulations of the distal ends are nearly 

 equal. The existence of a hallux is indicated by a small elongated depres- 

 sion on the inner metatarsal, a short distance above the articulation. As 

 in the same bone in Hesperofnis, there are no canals or grooves for tendons 

 on the posterior face of the proximal end. 



1 aitat aco, to deceive, and opvis, a bird. 



2 /3a7iToo, to plunge, and opvi? ; a bird. " 



