Williston.] Birds. 47 



I. anceps Marsh, Amer. Journ. Sci., in, 364, May, 1872 (Graculavus). 



The type specimen, from the North Fork of the Smoky- 

 Hill river, has never been figured. 



I. tener Marsh, Odontornithes, p. 198, 1880, pi. xxx, f. 8. 



Discovered by Mr. E. W. Guild, on the Smoky Hill river, 

 in 1879. 



I. validus Marsh, Odontornithes, p. 198, ff. 11, 14. 



Discovered by myself on the Solomon river, in 1877. 



I. victor Marsh, Amer. Journ. Sci., xi, 511, June, 1876. 



The type specimen was discovered by Dr. H. A. Brous on 

 the Smoky Hill river. Forty other specimens are re- 

 ferred by the author to the same species. 

 Apatomis. 



Marsh, Amer. Journ. Sci., v, 162, Feb. 1872. 

 A. celev Marsh, Amer. Journ. Sci., v, 74, Jan. 1872 {Ichthyornis). 



The type specimen was discovered by Marsh in 1872. A 

 more perfect specimen was found later by my brother, 

 Mr. F. H. Williston, in 1877. 



The systematic position of the toothed birds from Kansas is 

 by no means yet settled. All ornithologists are, however, 

 agreed that they do not form a separate group, and the name 

 Odontornithes is in consequence generally abandoned. The 

 value of the teeth is subordinate ; they do not in themselves 

 justify a separate subclass. 



Hesperornis regalis, the best-known species of the genus, was 

 a bird measuring about six feet from point of bill to the tip of 

 the feet when outstretched, or standing about three feet high. 

 It was an aquatic bird, covered with soft feathers, wholly wing- 

 less, the rudimentary wing bones doubtless being inclosed under 

 the skin, and not at all effective in locomotion. The legs were 

 strong and moderately long; the neck long and flexible. The 

 bill was long, and was provided with small but effective conical 

 teeth set in the jaw firmly. Those of the upper jaws were few 

 in number and set in the back part, while those of the mandibles 



