12 R. W. Shufeldt 



I have compared this bone with the coracoids of many species, 

 especially Grebes, LimicolcE, and other water birds, and I am con- 

 vinced that it belongs to a genus of which there are now no living 

 representatives. It possibly was a toothed form and related — but 

 not closely related — to Ichthyornis. 



Cat. No. 868 is likewise in this category; it is the anterior end of a 

 fossil scapula of the left side, which belonged to some bird of medium 

 size. As a rule, avian scapulae are not often, when taken alone, of 

 much value for identification, and this fragment is distinctly in this 

 class. 



CiMOLOPTER\'x RETUSA Marsh. 

 {Plate VI, Fig. 39.) 



Marsh, Amer. Joum. Sci., ser. 3, XLIV, 1892, 175, Pis. II-V (four views of 

 the coracoid). 



Holotype. Cat. No. 513, Peabody Museum, Yale University. Converse Co., 

 Wyoming. Cretaceous ("Laramie")- J. B. Hatcher, collector. 



The fragmentary head of a left coracoid (Fig. ZS) is also briefly 

 described by Marsh as cited above. 



Imperfect as the piece is, and meagre in the matter of material, it 

 is very evident that it belonged to a bird in an entirely different genus, 

 if not different family, from C. rara. 



The heads of these two coracoids are essentially very different; and 

 the remarkable part of it is that Professor Marsh noted these differ- 

 ences and yet ignored them. In describing the present one, he says: 

 "This bone lacks the strong inner process near the pit for the scapula, 

 which is characteristic of the smaller form." 



Their morphology as a whole is quite different, and the birds cer- 

 tainly belonged in different genera, to say the least. Why should they 

 be arrayed with the Passeres in the "Fossil Birds" of the A. O. U. 

 Check List (1910, p. 392) is not clear to me, for passerine birds they 

 surely are not. 



If such a List, these forms, as a genus, might be made to follow 

 after Ichthyornis, though with the understanding that Cimolopleryx 

 retusa belongs in a very different group; and, as a matter of fact, the 

 material upon which the species is made should be set aside as too 

 fragmentary for reference until more of it is at hand. 



